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    I think the curve is an optical illusion - those look like straight lines to me. By having the data points on the curve there, it can give that optical illusion. Commented Dec 8, 2015 at 21:48
  • So, how can I make it less serrated? I have to increase resolution? And how can I increase resolution in a simple way without having to change the dimension of lines dots and index? Commented Dec 8, 2015 at 21:52
  • Use a size parameter with set term. Commented Dec 8, 2015 at 21:55
  • In this way I have to change all the dimensions of dots lines and index. I tried with 'set terminal png size 1024,768' Commented Dec 8, 2015 at 21:59