1# Code table 4.2 - Parameter number by product discipline and parameter category 20 0 Seconds prior to initial reference time (defined in Section 1) (s) 31 1 Geographical latitude (deg N) 42 2 Geographical longitude (deg E) 53 3 Days since last observation (d) 6# 4-191 Reserved 7# 192-254 Reserved for local use 8255 255 Missing 9