Total intensity (upper panel), polarization angle (middle panel), and polarization degree (lower panel) of Sgr A* as a function of time (2006 June 1). The black data points are the result of the new calibration method, the red points are obtained by the previously used “boot strapping” method as published in Zamaninasab et al. (2010). The blue points show polarized flux (p  ×  I). The meridian transit occurred at 32.4 min, 50.4 min before the polarimetric measurements started.