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      Secondary Header Information
73 Secondary Header Variables
  1 Access#                        NODC Accession Number
  2 Project                        NODC Project Code
  3 Platform                       Platform Code
  4 Institution                    Institution Code
  6 WOD98 Unique Station Number 
  7 Originator's Station Number
  8 depth precision
  9 Weather Station                Ocean Weather Station Code
 10 Bottom Depth                   meters
 11 Cast Duration                  hours
 12 Cast Direction                 down assumed,1=up,2=average
 13 High resolution pairs
 14 Water Color                    Forel-Ule scale (00 to 21)
 15 Water Transparency             Secchi disk, meters
 16 Wave Direction                 WMO 0877 or NODC 0110
 17 Wave Height                    WMO 1555 or NODC 0104
 18 Sea State                      WMO 3700 or NODC 0109
 19 Wind Force                     Beaufort scale or NODC 0052
 20 Wave Period                    WMO 3155 or NODC 0378
 21 Wind Direction                 WMO 0877 or NODC 0110 (NOT degrees!)
 22 Wind Speed                     KNOTS (not mps)
 23 Barometric Pressure            millibars
 24 Dry Bulb Temperature           degrees C  
 25 Wet Bulb Temperature           degrees C    
 26 Weather Conditions
 27 Cloud Type                     WMO 0500 or NODC 0053
 28 Cloud Amount                   WMO 2700 or NODC 0105
 29 T-S Probe                      Temperature/Salinity probe type
 30 Calibration Depth  
 31 Calibration Temperature
 32 BT recorder                    WMO code 4770
 33 depth fix                      set to one if depth correction applied
 34 Bottom Hit                     set to one if bottom hit
 35 Digit Method                   XBT Digitization Method (NODC 0612)
 36 Digit Interval                 XBT Digitization Interval (NODC 0613)
 37 Data Storage                   XBT Data Storage Method (NODC 0614)
 38 Depth of Correction            MBT Depth Correction
 39 Temp Correction                MBT Temperature Correction
 40 Reference Type                 Instrument for reference temperature
 41 Visibility                     Horizontal visibility (WMO 4300)
 45 Absolute Humidity              g/m^3
 46 Ref/Surf Temp                  Reference/Sea Surface Temperature
 47 Surface Salinity               Sea Surface Salinity
 48 Chlorophyll method             file: methods.txt
 49 Nutrients method               file: methods.txt
 54 O2 originotor's unit           file: units.txt
 55 Nutrient originator's unit     file: units.txt
 56 Chlorophyll originator's unit  file: units.txt
 58 Alkalinity originator's unit   file: units.txt
 59 Filter type size               file: filter.txt
 60 Alkalinity method              file: methods.txt
 67 O2 method                      file: methods.txt
 68 Salinity method                file: methods.txt 
 69 Temperature method             file: methods.txt
 71 Radio signal                   =1 if data is from radio signal
 72 XBT Wait                       Wait parameter for depth calc
 73 XBT Freq                       Freq parameter for depth calc
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