Calibration

Error computation

For a given spectral window in a SPICE L2 file, represented as an astropy.io.fits HDU object, the average dark current as well as the uncertainties coming from noises can be obtained with

dark_noise, sigma = spice_error(hdu)

sigma is a dictionary containing the dark current noise, the background signal noise, the read noise, and the photon noise, and the total of these noise components. Values are given for each pixel when relevant.