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Implementation notes

The main call is:

hfpdf.pdf(pars, data)

which transforms a pair of data (the observed counts in the channels + the implied observations of the auxiliary measurements) and parameters (parameters of interest nuisance parameters) into a single float

  data (real and implied)                                                                      parameters
[ channel 1 | channel 2 | ... | channel n | aux meas 1 | aux meas 2 | ... | aux meas n]    [ par 1 | .... | par n ]

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[ ] single float pdf value