LBT MODS

Overview

This file summarizes several instrument specific items for the LBT/MODS spectrograph.

Edge Tracing

It has been reported that the default edge_thresh of 100 for MODS is too high for some setups. If some of your ‘fainter’ slits of the spectrum are missing, try:

[calibrations]
    [[slitedges]]
        edge_thresh = 20

Flux Calibration

The IR algorithm struggles to deal with the rapid dropoff in sensitivity at the blue end of MODS-R due to the dichroic in dual-band setups. One solution is to include the flatfield frame when running pypeit_sensfunc, as follows:

[sensfunc]
    flatfile = ../Calibrations/Flat_A_0_DET01.fits

where you should replace the flatfile with the path to the corresponding flatfield file for the standard star spectrum.