The 2003->2004 BS3 microcat data file contains the
structure "mc" with the following fields:


mc = 

        date: [8217x6 double]             time in ymdhms
        yearday: [8217x1 double]          2003 year days; noon on Jan 1 = 1.5
        datenumm: [8217x1 double]         matlab's time convention; appears to have a 4 year offset
        setup: [1x1 struct]               [see below]
        pressure: [8217x1 double]         pressure in dbar
        depth: [8217x1 double]            depth in [m] below surface
         SS: [8217x1 double]              sound speed [m/s]
         temp: [8217x1 double]            temperature [deg C]
         sal: [8217x1 double]             salinity [psu]
         cond: [8217x1 double]            conductivity [mS/cm]


mc.setup:

            cruiseID: 'sbi04'
           mooringID: 'bs3'
          instrument: 'Microcat SBE37-SM #2135'
            latitude: '71 23.69 N'
           longitude: '152 0.72W'
        bottom_depth: 144.5000
    instrument_depth: 134.5000
            temp_cal: -0.0027
            cond_cal: 0.0139
          start_time: [2003 10 5 12 0 1]
            end_time: [2004 9 11 20 0 1]
       in_water_time: [2003 10 5 10 0 1]
      out_water_time: [2004 9 10 21 0 1]
             comment: 'Bottom ADCP'
           processor: 'D. Torres, WHOI, 25-Sep-2009'