Update units in default_config.yaml

Co-authored-by: Sylvia Whittle <[email protected]>

topostats/default_config.yaml

@@ -74,9 +74,9 @@ disordered_tracing:
     method_outlier: mean_abs # The method to prune branches based on height. Options : abs | mean_abs | iqr.
 nodestats:
   run: true # Options : true, false
-  node_joining_length: 7.0 # The distance over which to join nearby crossing points.
-  node_extend_dist: 14.0 # The distance in ?? over which to join nearby odd-branched nodes.
-  branch_pairing_length: 20.0 # The length from the crossing point to pair and trace, obtaining FWHM's.
+  node_joining_length: 7.0 # The distance in nanometres over which to join nearby crossing points.
+  node_extend_dist: 14.0 # The distance in nanometres over which to join nearby odd-branched nodes.
+  branch_pairing_length: 20.0 # The length in nanometres from the crossing point to pair and trace, obtaining FWHM's.
   pair_odd_branches: false # Whether to try and pair odd-branched nodes. Options: true and false.
   pad_width: 1 # Pixels to pad grains by when tracing (should be the same as disordered_tracing).
 ordered_tracing: