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Some results in the search for 'zero' acceptance regions for electrons - W. Brooks, D. Rowntree
The first plot below shows reconstructed events from a run with all the inert volumes turned on. What is plotted is the values of the reconstructed variables.

The plot below shows the accepted events divided by the thrown events, using the thrown kinematic variables for both - superimposed on the thrown events.
The following plot shows the above two plots separately.
The following plots show several views of the acceptance as a function of theta and phi.