SGP/WPDN/X1 - Missing data

Per Kirk Holub at NOAA, data are not available for these two time periods.

• lon(lon)
• Alphanumeric station name(staNam)
• Water Vapor(waterVapor)
• -180.0 - +180.0(alt)
• Dry component GPS signal delay(dryDelay)
• Time of observation(timeObs)
• Station Location(staLongNam)
• Total GPS signal delay(totalDelay)
• base time in epoch(base_time)
• Formal Error(formalError)
• Derived pressure(pressure)
• Wet component GPS signal delay(wetDelay)
• Formal Error(sigma)
• Time offset from base_time(time_offset)
• Temperature used for calculation(temperature)
• North Latitude(lat)