The LC of AG Dra, from the year 1890 up until 2011 February. (a) Raw data of the two main sources, Harvard plates m_pg to the left of the vertical line and AAVSO visual data to its right. The crosses mark the few Belyakina (1969) data. (b) The LC scaled to a common colour system. The data are binned into 30 d equal width bins. A heavy vertical line marks the border between Sections A and B of the LC. Thin vertical lines separate Quiescence and High states of the system (see text for further explanations). (c) Photoelectric measurements in the U bandpass filter.