Another paper from Imperial College. This one looks at data from around Europe and uses it to estimate the effects of the various measures that have been taken. There are large error bars, but they will get smaller in coming weeks. 1/

https://www.imperial.ac.uk/media/imperial-college/medicine/sph/ide/gida-fellowships/Imperial-College-COVID19-Europe-estimates-and-NPI-impact-30-03-2020.pdf

Worryingly (see Figure 2, pp. 7-9), the authors suggest that it is not particularly likely that the measures taken so far are enough to bring the reproduction number below 1. 2/2