guruando con Borja
PfsSimpleSpectrum - https://github.com/Subaru-PFS/datamodel/blob/master/python/pfs/datamodel/pfsSimpleSpectrum.py
Target - https://github.com/Subaru-PFS/datamodel/blob/master/python/pfs/datamodel/target.py
MaskHelper - https://github.com/Subaru-PFS/datamodel/blob/master/python/pfs/datamodel/masks.py (usada para las flags)
from pfs.datamodel import Target, MaskHelper, PfsSimpleSpectrum
import numpy as np
flux = np.arange(300)