3D array was L(x,y,t)?

Thanks very much Jonathon for your help!

However, your functions do appear to be a bit strange.  Can it be right
that y appears nowhere in the body of either f0 or f1?

Yes I realize this looks strange. The function is the image intensity for
a drifting vertical sinewave grating (fuzzy bars). So the image always has
the same intensity for all y values at a given x. I can't just ignore y
because the energy is affected by it.

Bill

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