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DIS: FONLL b-PDF contributions #33

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felixhekhorn opened this issue Sep 23, 2021 · 0 comments
Open

DIS: FONLL b-PDF contributions #33

felixhekhorn opened this issue Sep 23, 2021 · 0 comments

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@felixhekhorn
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We believe to have found a bug in APFEL:

  • The FONLL prescription uses 4-flavor PDFs in the range between the charm mass and the bottom mass (using the assumtions threshold = mass)
  • we do not consider the case of intrinsic charm nor intrinsic bottom here
  • hence the bottom PDF should not contribute to F2light, since there is no 4-flavor bottom (as said, no intrinsic bottom), but we find it is contributing (see below)
  • this is present for all FONLL flavors
  • HOWEVER, this bug is not a problem in the fit, because there the bottom PDF only gets a non-zero value beyond the bottom mass and hence will not trigger this bug,
  • but, it is a bug for anyone else who uses APFEL to compute structure functions and who uses PDFs that where not obtained using the exact same value for the bottom PDF
  • the bug is most likely triggered by the fact, that APFEL uses evolution basis, which is always the full basis (and so, e.g., Singlet = u+d+s+c+b+t)

To give an explicit example:

  • below I attach a computation of F2light/FLlight in FONLL-A
  • mc = 1.95, mb=1e6 so it should be FONLL all the way
  • the PDF is bonly which is a dummy PDF containing only the b quark as x(1-x)
yadism + APFEL output
Computing for theory=b7b56b0, ocard=21882ed and pdf=bonly ...
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
[15:52:39] INFO     Inspecting runcards...                                               inspector.py:96
           INFO     Inspection completed: success ✓                                     inspector.py:100
           INFO     Interpolation: number of points = 49, polynomial degree = 4,    interpolation.py:440
                    logarithmic = True                                                                  
           INFO     {'MZ2': 8315.178393760001, 'CKM': CKM([[9.49221518e-01      coupling_constants.py:44
                    5.07600900e-02 1.20409000e-05] [5.07150400e-02                                      
                    9.47604903e-01 1.68100000e-03] [7.43044000e-05                                      
                    1.62409000e-03 9.98304719e-01]]), 'sin2theta_weak':                                 
                    0.23126, 'MW2': 6463.838403999999}                                                  
           INFO     {'process': 'EM', 'projectilePID': 11, 'polarization': 0,   coupling_constants.py:45
                    'propagatorCorrection': 0}                                                          
           INFO     RenScaleVar: False, FactScaleVar: False                       scale_variations.py:56
           INFO     Thresholds: walls = [0, 3.8024999999999998, 1000000000000.0, 1e+16, thresholds.py:79
                    inf]                                                                                
           INFO     PTO: 1, process: EM                                                    runner.py:146
           INFO     FNS: FONLL-A, NfFF: 4                                                  runner.py:147
           INFO     Intrinsic: []                                                          runner.py:148
           INFO     projectile: electron, target: {Z: 1, A: 1}                             runner.py:149
           INFO     Thresholds: walls = [0, 0.0, 1000000000000.0, 1e+16, inf]           thresholds.py:79
           INFO     Strong Coupling:                                              strong_coupling.py:151
                    a_s(µ_R^2=8317.440000)=0.009390=0.118000/(4π)                                       
                                 ┌────────────────────────────────────┐                                 
                                 │                                    │                                 
                                 │ __     __       _ _                │                                 
                                 │ \ \   / /      | (_)               │                                 
                                 │  \ \_/ /_ _  __| |_ ___ _ __ ___   │                                 
                                 │   \   / _` |/ _` | / __| '_ ` _ \  │                                 
                                 │    | | (_| | (_| | \__ \ | | | | | │                                 
                                 │    |_|\__,_|\__,_|_|___/_| |_| |_| │                                 
                                 │                                    │                                 
                                 └────────────────────────────────────┘                                 
                                              Plan                                                  

• F2_light at 40 pts
• FL_light at 40 pts

                                          Calculation                                               

yadism took off! please stay tuned ...
/home/felix/Physik/N3PDF/DIS/yadism/src/yadism/esf/conv.py:152: IntegrationWarning: The algorithm does
not converge. Roundoff error is detected
in the extrapolation table. It is assumed that the requested tolerance
cannot be achieved, and that the returned result (if full_output = 1) is
the best which can be obtained.
res, err = scipy.integrate.quad(
took 4.96 s
Compute external result

WARNING: FONLL-A is a VFN scheme
... setting VFNS PDF evolution
WARNING: FONLL-A is NLO scheme
... setting NLO perturbative order

Welcome to
/// //// //// ///_/ _/
_/ / / / / / /
//
/
/ //
/
/ //
/ //
/ _/
_/ _/ _/ _/ _/ _/
/ / / / //// ////
_____v3.0.5 A PDF Evolution Library, arXiv:1310.1394
Authors: V. Bertone, S. Carrazza, J. Rojo

Report of the evolution parameters:

QCD evolution
Space-like evolution (PDFs)
Unpolarized evolution
Evolution scheme: VFNS at N1LO
Solution of the DGLAP equation: 'exactalpha' with maximum 6 active flavours
Solution of the coupling equations: 'exact' with maximum 6 active flavours
Coupling reference value:

  • AlphaQCD( 91.2000 GeV) = 0.118000
    Pole heavy quark masses:
  • Mc = 1.9500 GeV
  • Mb = ******** GeV
  • Mt = ******** GeV
    The matching thresholds coincide with the physical masses
    muR / muF = 1.0000

Allowed evolution range [ 1.0000 : 10000.0000 ] GeV
The internal subgrids will be locked
Fast evolution enabled

Initialization of the evolution completed in 0.536 s

Report of the electroweak parameters:

Mass of the Z = 91.188 GeV
Mass of the W = 80.398 GeV
Mass of the proton = 0.9380 GeV
sin^2(thetaW) = 0.2313
GFermi = 1.16638E-05
| 0.9743 0.2253 0.0035 |
CKM = | 0.2252 0.9735 0.0410 |
| 0.0086 0.0403 0.9992 |
Z propagator correction = 0.00000

Report of the DIS parameters:

Computation in the FONLL-A mass scheme
Electromagnetic (EM) process
Scattering electron - proton
muR / Q = 1.0000
muF / Q = 1.0000
(No scale variation in the evolution)
Target Mass corrections disabled
FONLL damping factor disabled for all heavy quarks
Intrinsic charm disabled

Initialization of the DIS module completed in 5.943 s

LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
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LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
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LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1
LHAPDF 6.3.0 loading /home/felix/local/share/LHAPDF/bonly/bonly_0000.dat
bonly PDF set, member #0, version 1

Log added, hash=06dd72d0fd24320c82219a81afe221f795fc915f3a14ca711c8da4e2349f05a4

──────────
F2_light
──────────
x Q2 yadism yadism_error APFEL percent_error
0 0.000100 20.000000 0.0 0.0 0.000053 -100.0
1 0.000275 20.000000 0.0 0.0 0.000123 -100.0
2 0.000756 20.000000 0.0 0.0 0.000285 -100.0
3 0.002080 20.000000 0.0 0.0 0.000655 -100.0
4 0.005721 20.000000 0.0 0.0 0.001494 -100.0
5 0.015733 20.000000 0.0 0.0 0.003383 -100.0
6 0.043267 20.000000 0.0 0.0 0.007593 -100.0
7 0.118993 20.000000 0.0 0.0 0.016630 -100.0
8 0.327252 20.000000 0.0 0.0 0.032793 -100.0
9 0.900000 20.000000 0.0 0.0 0.021900 -100.0
10 0.000100 4.000000 0.0 0.0 0.000068 -100.0
11 0.000275 4.000000 0.0 0.0 0.000155 -100.0
12 0.000756 4.000000 0.0 0.0 0.000351 -100.0
13 0.002080 4.000000 0.0 0.0 0.000784 -100.0
14 0.005721 4.000000 0.0 0.0 0.001720 -100.0
15 0.015733 4.000000 0.0 0.0 0.003715 -100.0
16 0.043267 4.000000 0.0 0.0 0.007880 -100.0
17 0.118993 4.000000 0.0 0.0 0.016282 -100.0
18 0.327252 4.000000 0.0 0.0 0.031179 -100.0
19 0.900000 4.000000 0.0 0.0 0.024752 -100.0
20 0.100000 4.000000 0.0 0.0 0.014415 -100.0
21 0.100000 5.719877 0.0 0.0 0.014465 -100.0
22 0.100000 8.179247 0.0 0.0 0.014507 -100.0
23 0.100000 11.696071 0.0 0.0 0.014543 -100.0
24 0.100000 16.725021 0.0 0.0 0.014573 -100.0
25 0.100000 23.916263 0.0 0.0 0.014599 -100.0
26 0.100000 34.199519 0.0 0.0 0.014623 -100.0
27 0.100000 48.904257 0.0 0.0 0.014643 -100.0
28 0.100000 69.931579 0.0 0.0 0.014661 -100.0
29 0.100000 100.000000 0.0 0.0 0.014678 -100.0
30 0.001000 4.000000 0.0 0.0 0.000439 -100.0
31 0.001000 5.719877 0.0 0.0 0.000416 -100.0
32 0.001000 8.179247 0.0 0.0 0.000396 -100.0
33 0.001000 11.696071 0.0 0.0 0.000380 -100.0
34 0.001000 16.725021 0.0 0.0 0.000366 -100.0
35 0.001000 23.916263 0.0 0.0 0.000353 -100.0
36 0.001000 34.199519 0.0 0.0 0.000343 -100.0
37 0.001000 48.904257 0.0 0.0 0.000333 -100.0
38 0.001000 69.931579 0.0 0.0 0.000324 -100.0
39 0.001000 100.000000 0.0 0.0 0.000317 -100.0

──────────
FL_light
──────────
x Q2 yadism yadism_error APFEL percent_error
0 0.000100 20.000000 0.0 0.0 0.000002 -100.0
1 0.000275 20.000000 0.0 0.0 0.000005 -100.0
2 0.000756 20.000000 0.0 0.0 0.000013 -100.0
3 0.002080 20.000000 0.0 0.0 0.000035 -100.0
4 0.005721 20.000000 0.0 0.0 0.000094 -100.0
5 0.015733 20.000000 0.0 0.0 0.000246 -100.0
6 0.043267 20.000000 0.0 0.0 0.000605 -100.0
7 0.118993 20.000000 0.0 0.0 0.001272 -100.0
8 0.327252 20.000000 0.0 0.0 0.001712 -100.0
9 0.900000 20.000000 0.0 0.0 0.000078 -100.0
10 0.000100 4.000000 0.0 0.0 0.000002 -100.0
11 0.000275 4.000000 0.0 0.0 0.000007 -100.0
12 0.000756 4.000000 0.0 0.0 0.000018 -100.0
13 0.002080 4.000000 0.0 0.0 0.000049 -100.0
14 0.005721 4.000000 0.0 0.0 0.000133 -100.0
15 0.015733 4.000000 0.0 0.0 0.000348 -100.0
16 0.043267 4.000000 0.0 0.0 0.000855 -100.0
17 0.118993 4.000000 0.0 0.0 0.001799 -100.0
18 0.327252 4.000000 0.0 0.0 0.002421 -100.0
19 0.900000 4.000000 0.0 0.0 0.000111 -100.0
20 0.100000 4.000000 0.0 0.0 0.001613 -100.0
21 0.100000 5.719877 0.0 0.0 0.001475 -100.0
22 0.100000 8.179247 0.0 0.0 0.001360 -100.0
23 0.100000 11.696071 0.0 0.0 0.001262 -100.0
24 0.100000 16.725021 0.0 0.0 0.001179 -100.0
25 0.100000 23.916263 0.0 0.0 0.001106 -100.0
26 0.100000 34.199519 0.0 0.0 0.001042 -100.0
27 0.100000 48.904257 0.0 0.0 0.000985 -100.0
28 0.100000 69.931579 0.0 0.0 0.000934 -100.0
29 0.100000 100.000000 0.0 0.0 0.000889 -100.0
30 0.001000 4.000000 0.0 0.0 0.000024 -100.0
31 0.001000 5.719877 0.0 0.0 0.000022 -100.0
32 0.001000 8.179247 0.0 0.0 0.000020 -100.0
33 0.001000 11.696071 0.0 0.0 0.000019 -100.0
34 0.001000 16.725021 0.0 0.0 0.000017 -100.0
35 0.001000 23.916263 0.0 0.0 0.000016 -100.0
36 0.001000 34.199519 0.0 0.0 0.000015 -100.0
37 0.001000 48.904257 0.0 0.0 0.000015 -100.0
38 0.001000 69.931579 0.0 0.0 0.000014 -100.0
39 0.001000 100.000000 0.0 0.0 0.000013 -100.0

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