CASSIS products (high-resolution)

Reading the default downloadable spectra:

In Python, some examples:

• IPAC tables can be read with astropy.table:

from astropy.table import Table 
t=Table.read('cassis_tbl_opt_16205568.tbl', format='ascii')

• YAAAR FITS files can be read with astropy.io.fits:

from astropy.io import fits
import numpy as np
hdu = fits.open('cassis_yaaar_opt_16205568.fits') 
ncols = len(hdu[0].data[0,:])
wdata = np.array(hdu[0].data[:,0])
fdata = np.array(hdu[0].data[:,1])  

• Unfortunately, YAAAR FITS files are not recognized by Table.read, but to read YAAAR FITS files as Tables, one can do:

hdu = fits.open('cassis_yaaar_opt_16205568.fits') #default is readonly
names=tuple([hdu[0].header['COL*DEF'][x] for x,h in enumerate(hdu[0].header['COL*DEF'])])
t=fits.BinTableHDU(data=Table(hdu[0].data, names=names), header=hdu[0].header)

List of available products

Main products:

Diagnostic products for optimal extraction:

Quick explanation on the file naming convention (most of the non-standard files are available by request):

Help to read directories and files (internal use)

• hropt_help.pdf: hropt_help.pdf