Monitoring of X-Ray Sources in the Optical Spectral Region
(a) Segment of the long-term light curve of the intermediate polar V1223 Sgr on the Bamberg photographic plates. The intervals of missing data are seasonal gaps. Closed circles represent the individual observations. The data in the densely covered segments are connected by a line to guide the eye though the complicated profile of the light curve. Large open circles denote the annular averages. The largely deviating point in JD 2439 383 represents a flare and is not included in the annular mean. (b) Statistical distribution of the brightness in the long-term light curve. The largely deviating point marked with an arrow represents the flare.