I have been studying a recent paper, and wanted to extract the some data from it, in an effort to reproduce it. I wrote to the authors, and got no response, so I got the raw data by digitalizing a figure in the paper where the data is plotted.
Then I made another plot, where I plot the raw data together with mine on top of each other, to compare them. If I publish this plot and properly cite their paper, do I need to ask them for permission?
It looks like I don't, because this is not like copying and pasting a figure of theirs, but I am not 100% sure.