Header file for fco2p17na.dat and fco2p17nw.dat
8 column format
missing values are "NaN"

Value 1:        Year Day/UTC time Jan.1/midnight==1.0
Value 2:        Latitude (- for S)
Value 3:        Longitude (- for W)
Value 4:        Salinity PSU
Value 5:        Sea Surface Temperature deg.C
Value 6:        Barometric Pressure mbar
Value 7:        fCO2 (Sea Water[w] or Air[a]) micro-atmospheres