[Eeglablist] extracting Epochs

[Lina Ismail]

Dear all,
I am following Makotos  preprocessing order (02/28/2020 updated)
as follows:

  1.  Change the option to use double precision
  2.  Import data
  3.  Downsample if necessary
  4.  High-pass filter the data at 1-Hz (for ICA, ASR, and CleanLine)
  5.  Import channel info
  6.  Remove line noise using CleanLine
  7.  Apply clean_rawdata() only to reject bad channels.
  8.  Interpolate all the removed channels
  9.  Re-reference the data to average
  10. Apply clean_rawdata() only to perform Artifact Subspace Reconstruction (ASR).
  11. Re-reference the data to average again--this is to reset the data to be zero-sum across channels again.
  12. Run AMICA using calculated data rank with 'pcakeep' option (or runica() using 'pca' option)
  13. Estimate single equivalent current dipoles
  14. Search for and estimate symmetrically constrained bilateral dipoles

My question  is after step 11 which means before running AMICA,  I starts extracting the data epochs it gave me few number of epochs compared to my real epochs. for example, 9 but I suppose to have 33. However, when I skip doing Artifact Subspace Reconstruction (ASR) alone byt remove the bad channels it gave me the correct number of epochs!
Do you have clarification for that?