3D Surface graph color map interpolation issue

[LVCoder]

Hi All,

I am trying to plot speaker directivity on a 3D Surface graph and having some issues with the color map interpolation. I have set the color map such that the color changes every 3 dBs and I do not want to interpolate or add any gradient to the colors. I want to have a fixed color for the specified dB range, but apparently, the graph is still adding some gradients to the colors.

As you can clearly see in the graph above it is adding some gradients at the edge of the value range. I am looking for a fixed color. I tried to play with different settings but could get what I am looking for.

I have also attached a vi with data and graph for anyone of you to look at.

The vi attached is in LV 14 but I tried this in LV 2022 and get the same behavior. 

Can someone tell me if it's possible to show discrete colors in the surface graph without any interpolation or gradients?

Thanks!