I arrived in Heidelberg for my annual stay at MPIA today. I had a brief conversation with Rix about Milky Way streams, in preparation for Price-Whelan's arrival tomorrow. I also had a brief conversation with Finkbeiner (CfA) about PanSTARRS calibration. He can show that things are good at the milli-magnitude level, but I think he ought to be able to say even more precise things, given the number of stars and the regularities. In the end, most of his precision tests involve comparison to the SDSS-I imaging data, so that is what really limits the precision of his tests.