Questions abt

Hi, we are trying to follow the code in the to do parameterization with stl files.

In the example, there are 9 files with radius 0.2, 0.3, 0.4 and width 1, 1.5, 2.
My qn is do we need the stl files with radius 0.3 and width 1.5?
Because our parameterization range is 0.2 to 0.4 and 1 to 2.

Why do we need the files in between? If so, will it be better if we have more files in between?

Please advise.