Field of NGC 2516 from the Digitized Sky Survey 2 (red filter), with our time-series observing fields overlaid in black contours. Individual fields are square, with each labelled in the North-East corner. The inner fields (1 through 4) were observed with exposure times of 60 s in V and 120 s in I_c filters, while the outer (deep) fields received 600 s in the I_c filter. Apart from a small overlap with our outer fields, the region covered by Irwin et al. (2007) lies beyond that of this study, extending the total area covered by time-series observations to > 1 sq. deg.