The instrument visualizes electoral data in the form of histograms.
Suitable for aggregation values, i.e. for Y axis, are number of PECs, number of registered voters, number of votes, etc.
Video tutorial: "Two-Humped Moscow". (in Russian). In constituencies with uniform population, the violation of unimodality of distributions might be an indicator of fraud and manipulation. Falsifications at Duma Elections of 2011 were confirmed by witnesses and evidence. After mass protests of 2011-2012, the authorities has been abstaining from falsifications in Moscow, and the unimodality in this constituency was restored and has been observed ever since.
You can open the instrument in a new window/tab.