The arts/uvspec simulation shown in the right plot of Fig. 8 require
several steps. The different steps produce large files (several MB)
and the uvspec run requires about 12 GB of RAM to execute. Due to the
size of the intermediate files we only include the input files used in
the various steps and the final uvspec output files.

Note that in all input files paths must be set to match your
installation. 

Step 1: Use arts to make mol_tau_file 
-------------------------------------
# You need to install the arts model to do this. Then execute:

arts input.arts


Step 2: Calculate ash single scattering properties
--------------------------------------------------
mie < mie.inp


Step 3: Run uvspec
------------------
Do this for the clear (=cloudless), ice, ash only, and ash and ice
cases. 

uvspec < uvspec_clear.inp > uvspec_clear.raw

# and similar for the other uvspec input files.


Step 4: Account for instrument response function
------------------------------------------------
# Do all steps below for all uvspec .raw output files

#First invert file sine spline needs increasing numbers
tac uvspec_clear.raw > uvspec_clear.tac

#Spline interpolate to high resolution
spline -l -s 0.001 -q uvspec_clear.tac  > uvspec_clear.eqgrid

# Convolve with slit function
conv uvspec_clear.eqgrid SLIT_GAUSS_FWHM_0_5 > uvspec_clear.conv

# Interpolate to IASI resolution.
spline -l -s 0.25 -q uvspec_clear.conv  > uvspec_clear.out

