SGP/SIRS/E31 - Instrument

During the affected time period, the solar tracker was not operating correctly; 
short_direct_normal and down_short_diffuse_hemisp are incorrect.

• short_direct_normal
• short_direct_normal_max
• down_short_diffuse_hemisp_min
• down_short_diffuse_hemisp_max
• down_short_diffuse_hemisp_std
• short_direct_normal_min
• short_direct_normal_std
• down_short_diffuse_hemisp

• inst_direct_normal
• inst_diffuse