[Freesurfer] trouble with freeview View > Show Color Scale

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Hello,

I'm having a bit of trouble with the Show Color Scale option. I have run TRACULA and have loaded a text file containing p-values from an analysis (Spline Color: Heatscale, Scalar map: my p-values file). The values display correctly on the tract.

However, when I use View > Show Color Scale, it looks like the color scale is generated is for the black-and-white volume, instead of for those values. See attached screenshot. I'm instead trying to generate a Color Scale at the right of the figure that shows which colors (yellow to red) correspond to which p-values.

Thanks for your help, Liz