Load 2-3 data files, map each file's own X/Y columns independently, and overlay everything on one shared plot.
Upload files to choose X/Y columns for each one.
Every trace from every file is drawn on this single plot so overlapping lines are easy to compare directly. Since column order can differ between files, pick X and Y columns separately for each one. Color matches each file's panel frame below, and dash style distinguishes multiple Y columns picked from the same file. Marker shape also identifies the file.
Files should contain columns separated by whitespace. Any number of columns is supported.
Example: 0.0200 1.0791 0.0000E+00 0.0000E+00 1.2345 6.7890