Hello Ronke,
I did not look at your color source data. However, because the rendering indices are by definition integers and the "Ra" value is an average of the first 8, the resolution cannot be less than 0.125.
That being said, while the code is less than perfectly constructed feel free to dig back to where all these things are calculated and remove the "round to nearest" function (located near the output of the aptly-named "Ra Calc.vi"). This will invalidate some of the actual science behind the numbers but will give you your "resolution"...
Cheers,
