Python code to generate a delta field from eBOSS pixel data (as produced by Vazquez Gonzalez & Slosar)

requirements:
* python 2.7
* iminuit 1.2 or later
* fitsio
* healpy

example run over 1000 spectra (the DLA catalog is not required):

python bin/do_deltas.py --in-dir data/ --drq ../DR14Q_v1_1.fits --dla-vac ../dlas/DLA_DR14_v1b.dat --out-dir deltas/ --nspec 1000


where data/ is the directory containing the pixel files and deltas/ the output directory