SGP/SWATS/E6 - Sensor failure, 15-cm W

All variables from the 15-cm depth on the west profile are reporting as -9999.  Sensor has 
failed.

Use 15cm E measurements

• Soil Water Potential, West Profile(soilwatpot_W)
• Volumetric Water Content, West Profile(watcont_W)
• Sensor Temperature Rise, West Profile(trise_W)
• Soil Temperature, West Profile(tsoil_W)