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    $\begingroup$ megadata[[All, {1, 4}]] $\endgroup$ Commented Jul 15, 2014 at 22:59
  • $\begingroup$ This is closely related to Manipulating a sublist based on position although there are even closer posts, you should find them. $\endgroup$ Commented Jul 15, 2014 at 23:00
  • $\begingroup$ If you want to remove points i order to test a fit then I'd suggest using Cases with some sort of condition applied to a pattern. But we'd need an example of your real data. $\endgroup$ Commented Jul 15, 2014 at 23:03
  • $\begingroup$ @artes Your +1 and accepted answer in the cited link is somehow but not "closely" related :) $\endgroup$ Commented Jul 15, 2014 at 23:21
  • $\begingroup$ @eldo Thanks for an upvote, however a remark is needed, there is some kind of relativity in the concept of distance, so I don't insist that it is universal. When it comes to this problem I have to ask why you don't use a simpler and nicer approach: list /. {a_, b_, c_, d_} :> {a, d}? $\endgroup$ Commented Jul 15, 2014 at 23:37