The reconvolution f_tilde = R f of spectro-perfectionism decorrelates the noise but at the price of adding back signal from neighboring fibers, a signal that was carefully removed with the PSF extraction.
With DESI sims, at 4300A, fiber 2, it generates a very small crosstalk of 5 10^-5 . But this is with sims, the effect might become larger with real PSFs.
The reconvolution f_tilde = R f of spectro-perfectionism decorrelates the noise but at the price of adding back signal from neighboring fibers, a signal that was carefully removed with the PSF extraction. With DESI sims, at 4300A, fiber 2, it generates a very small crosstalk of 5 10^-5 . But this is with sims, the effect might become larger with real PSFs.