def _post(args: argparse.ArgumentParser) -> None:
"""Additional tasks."""
if args.cubes and (args.position or args.reference or args.coordinate):
# Load cubes
for cube_file in args.cubes:
# Cube
args.log.info(f'Loading cube: {cube_file}')
cube = spectral_cube.SpectralCube.read(cube_file)
wcs = cube.wcs.sub(['longitude', 'latitude'])
# Positions
args.position_fn(args, wcs=wcs)
# Extract spectra
for position in args.pos:
args.log.info(f'Loading spectra at: {position}')
spec = Spectrum.from_cube(cube, position, vlsr=args.vlsr)
# Filter molecules
molec = spec.filter(args.molec)
# Frequency range
if args.freqrange is not None:
xlim = args.freqrange
suffix = f'{xlim[0].value:.2f}_{xlim[1].value:.2f}_'
else:
xlim = None
suffix = ''
# Plot
suffix = (f'_spectrum_{molec.name}_'
f'{suffix}'
f'{position[0]}_{position[1]}.png')
output = cube_file.stem + suffix
output = args.outdir[0] / output
spec.plot(output, molecule=molec, xlim=xlim)
