Summed Gamma Spectra. Gamma spectra are summed because an individual gamma spectrum taken over a pixel (a collection interval of about 19.7 seconds) does not contain enough counts to be statistically significant. Individual spectra over a particular time period may be summed on the fly over 5-degree by 5-degree latitude-longitude cells, and the date range will be adjusted to a time period of 15 degrees of solar longitude (). Once data has been summed, it may be used for scientific data analysis.