OK, I have found the answer for Frequency:
R = Range values
F = Frequency values
a = (Rmax - Rmin) / ( ln(Fmax) - ln(Fmin) )
b = Rmin - a * ln(Fmin)
R = a * ln(F) + b
But it doesn't work for Bandwidth. It works only when applied to max and min values. Any idea?