File format : GRIB2
    -1 : Institut Source   T Steptype Levels Num    Points Num Dtype : Parameter ID
     1 : DWD      unknown  v instant      66   1    177408   1  P24  : 6.3.0         
   Grid coordinates :
     1 : lonlat                   : points=177408 (336x528)
                              lon : 5.265625 to 15.73438 by 0.03125 degrees_east
                              lat : 47.13281 to 55.36719 by 0.015625 degrees_north
   Vertical coordinates :
     1 : generalized_height       : levels=66
                           height : 11000.5 to 33 
                           bounds : 1-22000 to 66-0 
                            zaxis : number=4
                             uuid : b04cd2b4-f7bf-25d2-a622-995f14f302b8
   Time coordinate :  1 step
     RefTime =  2018-01-01 00:00:00  Units = hours  Calendar = proleptic_gregorian
  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss
  2018-02-01 00:00:00