=== Advanced config ===
To edit the boundaries of the 2D spectrum (cyan lines in 2D plot window) edit as root the following file:
'''/usr/local/etc/qlgui/pars.json'''The upper and lower bounds of the slit (which can be read off the 2D plot window using the cursor) are given by '''sl0''' and '''sl1''' respectively for the given grating name. e.g. for grating 5, the upper and lower bands are gr5_sl1 and gr5_sl0. Edit the numbers appropriately and resave the file