In order to examine inter-night and long-term optical variability trends more clearly, we have generated a compressed version of the DLCs, integrating just the data acquired during the first and the last hour of observations on each night. This gave two data points per night (excepting a couple of cases when the entire duration of observation was less than two hours and therefore only one data point could be obtained). The above integration typically involved 3-4 data points in B and V, and 5-6 data points in R and I passbands. The compressed DLCs are shown in Fig. 3.
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