Calculation of rain amount in mm is not correct

[oochiewallie]

Buienradar is saying this:

"Use the following formula to convert to precipitation intensity in the unit millimeter per hour (mm/h):
Precipitation intensity = 10^((value-109)/32)
To check: a value of 77 is equal to a precipitation intensity of 0.1 mm/h."

Source: https://www.buienradar.nl/overbuienradar/gratis-weerdata

So, the calculation should be:

RainfallIndex == 0 ? 0 : Math.Pow(10.0, (RainfallIndex - 109.0) / 32.0)

Instead of:

RainfallIndex == 0 ? 0 : Math.Pow(10.0, (RainfallIndex - 108.8805792) / 73.67120307)