One approach might be to do this:

  set the itemDelimiter to tab
  repeat for each line L in tData
    add 1 to counter
    put counter & comma after tArray[item 3 of L]
  end repeat

Now you have an array, the keys of which are the pemMass values, and the contents of which are item lists of the line numbers with those values. You can now do your comparisons to obsMass on the keys, and those which meet the criteria will give you a list of lines in your original data.

It's still going to be a longish process, though!

Best,

Mark
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