The Engineering data are time series records taken over the course of a day. Data files are labeled with the date. Individual records are a single data collection interval, which is variable in duration. Engineering values are sub- divided by type, with a parameter name, collection time, raw value, and engineering value. In general, temperatures are reported in Celsius, currents in amps, and potentials in volts. The units field is the definitive source for the units of measure. Engineering values are specific monitor values recorded by the GRS CEB. Engineering data are composed of the 66 different engineering readings monitored in the GRS, and the associated timing information. The engineering readings can be taken at several different time intervals, which can be changed depending on spacecraft operation. Times associated with the individual readings can be used to determine the sampling intervals. The following is a list of all the engineering readings and a description of each.