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  • $\begingroup$ ps is not defined, did you mean points? $\endgroup$ Commented Apr 1, 2015 at 12:53
  • $\begingroup$ Oh yes. Thanks. Edited. $\endgroup$ Commented Apr 1, 2015 at 13:08
  • 2
    $\begingroup$ Great answer. The last view of the slices is particularly interesting :) $\endgroup$ Commented Apr 2, 2015 at 8:37
  • 1
    $\begingroup$ All the answer posted are very good. I'll accept yours because of the slices picture :) $\endgroup$ Commented Apr 4, 2015 at 11:48
  • 1
    $\begingroup$ The solutions are great, my compliments. $\endgroup$ Commented Apr 6, 2015 at 3:42