The computation of the DFHRS database was done in a cooperation between Ingenieurbüro Seiler
and the RaD project DFHBF at IAF/HSKA.
The quality of DFRHS database Luxembourg is 1cm. The fig. below shows the isolines of the HRS N(B,L,h) computed with DFHRS-software version according to the DFHRS approach stage 1, formulas (2a-f).