Add points interactively to a point data set

Two two-column matrices of points marked on and off

1 | ```
data(amacrines)
``` |

Two two-column matrices of points marked on and off

http://www.maths.lancs.ac.uk/~diggle/pointpatterns/Datasets/, Peter J. Diggle, Department of Mathematics and Statistics, Lancaster University, Lancaster LA1 4YF, UK: public-domain spatial point pattern data-sets.

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