The next step is finding a test condition among the eight conditions that would
serve as the standard test condition. The RTI values of detector samples will be
measured only under this condition and the average RTI value will be assigned as the
RTI value of the given detector type. The ideal qualities of the condition are: (1) the
RTI value measured under the condition should be close to the average of the RTI
values measured under all the eight test conditions, and (2) the measured RTI values
obtained through multiple tests under the condition should exhibit a low degree of
fluctuations, i.e., a good reproducibility of tests.