Write lookup tables - similar as it is done for the PSFs - for all matrix parameters except tx and ty.
All parameters should be calculated ONCE for each order in advance of tracing.
optional:
write lookup table also for tx, ty as well as for dtx and dty (numerical derivatives of tx and ty)
for Interpolating tx and ty use difference dLambda between lookup table wavelength and 'true' wavelength correct linearly with dtx and dty respectively. (similar to what is used to interpolate CDF)
Write lookup tables - similar as it is done for the PSFs - for all matrix parameters except tx and ty. All parameters should be calculated ONCE for each order in advance of tracing.
optional: write lookup table also for tx, ty as well as for dtx and dty (numerical derivatives of tx and ty) for Interpolating tx and ty use difference dLambda between lookup table wavelength and 'true' wavelength correct linearly with dtx and dty respectively. (similar to what is used to interpolate CDF)