use fjdu radex grids
add text about the baseline removal process that is draining your brain
add a script to create mean spectra from each map field
lots of work from the past day; some just plot cleanup, some new data
inspection.  There is one change down below that is not true, so I'm a
little concerned (fitted_line_parameters was never renamed)
notebook rerun, minor changes elsewhere
add two new notebooks on baselines/baseline flagging