Source variability (5 columns)

PN_CHI2PROB (E) SAS task ekstest: The Chi² probability (based on the null hypothesis) that the source as detected by the PN camera is constant. The Pearson's approximation to Chi² for Poissonian data was used, in which the model is used as the estimator of its own variance (see the documentation of ekstest for a more detailed description). If more than one exposure (that is, time series) is available for this source the smallest value of probability was used. See Sec. 3.1.4 for more details.
M1_CHI2PROB (E) SAS task ekstest: The Chi² probability (based on the null hypothesis) that the source as detected by the M1 camera is constant. The Pearson's approximation to Chi² for Poissonian data was used, in which the model is used as the estimator of its own variance (see the documentation of ekstest for a more detailed description). If more than one exposure (that is, time series) is available for this source the smallest value of probability was used. See Sec. 3.1.4 for more details.
M2_CHI2PROB (E) SAS task ekstest: The Chi² probability (based on the null hypothesis) that the source as detected by the M2 camera is constant. The Pearson's approximation to Chi² for Poissonian data was used, in which the model is used as the estimator of its own variance (see the documentation of ekstest for a more detailed description). If more than one exposure (that is, time series) is available for this source the smallest value of probability was used. See Sec. 3.1.4 for more details.
VAR_FLAG (L): The flag is set to True if this source was detected as variable (Chi² probability < 1E-5, see PN_CHI2PROB, M1_CHI2PROB, M2_CHI2PROB) in at least one exposure (see Sec. 3.3.7).
VAR_EXP_ID (13A): If the source is detected as variable (that is, if VAR_FLAG is set to True), the exposure ID of the exposure with the smallest Chi² probability is given here.