imax 1  number of channels
jmax 1  number of backgrounds
kmax 2  number of nuisance parameters (sources of systematical uncertainties)
------------
# One channel, in which we observe 0 events
bin            ch1
observation    0
# ------------
bin            ch1    ch1
process        S      B
process        0      1
rate           4.76   1.47
# ------------
deltaS  lnN    1.20   -      20\% uncertainty on signal
deltaB  lnN    -      1.50   50\% uncertainty on background
