SGP EBBR E20 - E20 EBBR Soil Heat Flow #4 Incorrect

The SHF #4 produced large negative values during much of the
period because of a broken lead wire. Inspect the data to 
determine the times of incorrect SHF #4 values.

• surface_soil_heat_flux_4
• corr_soil_heat_flow_4
• latent_heat_flux
• soil_heat_flow_4
• surface_soil_heat_flux_avg
• sensible_heat_flux

• soil_heat_flow_4_mv