Select colormap for slope colors, and select line widths

[akboudalis]

Three additional Opt fields are added, which control:
-Slope colormap
-Zeeman line width
-Transition line width

[stestoll]

Thanks for this!

1. You should add defaults for the new options.
2. I don't think you can pass Opt as first input argument to windowButtonMotionFcn, since MATLAB calls the function with two input arguments src and event.
3. Please don't change the default line widths.

[akboudalis]

I have tried to correct/update/revert according to the comments.

Hopefully this comes closer.

[stestoll]

Right now, the function crashes if called without the Opt argument. Please add defaults for the new fields. Here is how it's done for the other fields:

if ~isfield(Opt,'SlopeColor')
  Opt.SlopeColor = false;
end