Estimate with Poisson Statistics (90% CL) for little number signals (no bkgd)

** Numbers from  0 to 20 taken from  hep-ph/9711021 v2
** Numbers from 21 to 29 taken from extrapolation of previous numbers
** ==> MAX=-0.0088*x**2+1.45*x+2.88 et MIN 0.014*x**2+0.43*x-0.34
pois_min(33) 0.    0.11  0.53  1.10  1.47  1.84  2.21  3.56  3.96  4.36
             5.50  5.91  7.01  7.42  8.50  9.48  9.99 11.04 11.47 12.51
            13.55 14.87 15.90 16.96 18.05 19.16 20.30 21.48 22.68 23.90
            25.16 26.44 27.76
pois_max(33) 2.44  4.36  5.91  7.42  8.60  9.99 11.47 12.53 13.99 15.30
            16.50 17.81 19.00 20.05 21.50 22.52 23.99 25.02 26.16 27.51
            28.52 29.44 30.52 31.57 32.61 33.63 34.63 35.61 36.58 37.53
            38.46 39.37 40.27 
If you obtain N=5 events in selection, which means  the limit [1.84;9.99] on the possible mean value