F is the total intensity, H is the horizontal intensity,
both in Nanotesla [nT] (always positive).
Z is the vertical intensity in Nanotesla [nT] (positive down).
D is the angle between geographic and magnetic north in minutes ['] (postive east).
Declination near Fuerstenfeldbruck and Munich is around 90', that means 1°30' East or 1.5° East.
Time is given in universal time [UT], that means CET - 1 hour or CEST - 2 hours. Data resolution is 1 minute. The Munich earth Observatory is part of University Munich.