calculate_required_additional_nsb

lstchain.image.modifier.calculate_required_additional_nsb(simtel_filename, data_dl1_filename, config=None)

Calculates the additional NSB needed in the MC waveforms to match a real data DL1 file

Parameters:

simtel_filename: a simtel file containing showers, from the production

(same NSB and telescope settings) as the one on which the correction will

be applied. It must contain pixel-wise info on true number of p.e.’s from

C-photons (will be used to identify pixels which only contain noise).

data_dl1_filename: a real data DL1 file (processed with calibration

settings corresponding to those with which the MC is to be processed).

It must contain calibrated images, i.e. “DL1a” data. This file has the

“target” NSB which we want to have in the MC files, for better

agreement of data and simulations.

config: configuration containing the calibration

settings used for processing both the data and the MC files above

Returns:

extra_nsb: additional NSB rate in absolute units, p.e./ns (a.k.a. “GHz”),

that has to be added in the MC to match the real data

data_ped_variance: Pedestal variance from data

mc_ped_variance: Pedestal variance from MC, AFTER THE TUNING!