How are the B, R, Z band fluxes merged in DESI spectra downloaded with the SPARCL library?

Question

Hello, I've noticed that when using the SPARCL Python package to access DESI spectra, the data from the B, R, and Z spectral arms already appears merged into a spectrum. However, I haven't found documentation explaining the methodology behind this merging process. Where can I find technical details about how these spectral arms are calibrated and combined?

Answer 1

The B, R, Z arms are combined using DESI’s functionality desispec.coaddition.coadd_cameras briefly described here, and with this source code.

We are working on identifying or updating additional references to this code.