I created a contour plot from my data, the first image below shows the bar chart which I am getting but I need it to look like the second image (I created by paint) the first number should start from zero and go up one by one, how can I do that? enter image description here

enter image description here

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    $\begingroup$ Do you want discrete steps or a continuous gradient? $\endgroup$ – Mr.Wizard Feb 28 '17 at 15:26
  • $\begingroup$ Discrete, distance between each step should be 1. $\endgroup$ – Parviz Feb 28 '17 at 15:27
  • $\begingroup$ I that case you are going to run into this issue: (85444) $\endgroup$ – Mr.Wizard Feb 28 '17 at 15:31

With BarLegend patched according to BarLegend can't make spaced contours when contours number>11 please try:

BarLegend[{"Rainbow", {0, 13}}, Range[0, 13]]


BarLegend[{"Rainbow", {0, 13}}, Range[0, 12, 1/2]]

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