QC work: Sunspot areas and tilt angles for solar cycles 7 – 10

New paper in A&A of interest to some Talkshop readers. The authors use drawings by Schwabe, from there estimate details about solar marks. Recently solar cycle 24 has been likened to solar cycle 7, adding interest

Sunspot areas and tilt angles for solar cycles 7–10
V. Senthamizh Pavai, R. Arlt, M. Dasi-Espuig, N.A. Krivova, and S. K. Solanki
A&A 584, A73 (2015)
DOI: 10.1051/0004-6361/201527080
Open access on registration

Fig.2. Example of the drawing style in the initial period of 1825-1830.
This full-disk drawing of 1827 June 13 shows large spots which com-
bine several umbrae and at least part of the penumbral area, as is re-
vealed by the detailed drawings.

I’m short on energy, above is brief and without much in the way of quotes. Any who look at the paper please add detail in comments.

Post by Tim