scattered dead pixels. Consequently, due to small positional shifts between the different observing nights some stars could not be measured on all 15 frames.

CTIO data
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From August 2003 to January 2004, we continued the monitoring with ANDICAM at CTIO’s 1.3m telescope operated by the SMARTS consortium. The size of the CCD field is 6x6 arcminutes and the pixel scale is 0.37 arcsec/pixel. A description of the camera is given in DePoy et al.([@andi03]). Due to the smaller FOV we had to make a mosaic of images to cover most of the cluster. Even then, we were limited to the central part, and some of the outer areas covered by the Mount Stromlo data could not be observed. Observations were done in $V$ and $I_{\rm c}$. Observations were scheduled roughly once per week giving a total of 16 useable frames. As for the Mount Stromlo data, observations were done in queue observing mode.

Other data
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Six observations of the cluster in $V$ and $I_{\rm c}$ were taken in service mode with the WFI at the ESO 2.2m. These observations were obtained between June and September 2002. Four additional observations taken in July/August 2003 were kindly provided by Laszlo 