How to select points on a scattered plot with mouse?

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Hallo everyone,

I have a scattered plot and I need to pick some points. Once I select the points, then i need to generate a curve with the help of this points. I tried to use getpts command, but unfortunately I do not have Image processing toolbox. Is there any nice way to select these points instead of writing code? Can someone suggest me any command/function which does this job?

Thanks