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You will have to upload them as data to your worksheet, which should be relatively straightforward in that interface. (One of the things the old Sage notebook does better in some ways than the Jupyter notebook.) Note that you will have to use an auxiliary variable DATA - see the help link in the notebook for details.

(If you had something available on the web that might be different, by the way; there could be a way to ask Python to access that remote file, I think.)