This plot has no source code available, which makes it almost impossible to retouch or make SVG versions.The SVG file of this plot contains extensive hardcoded data set, which blocks the further revisions.
For the plots generated by programs, it will be much more convenient for the future edits if one leaves the program source code after uploading the vector images. Usually it is extremely difficult to reproduce the plot in an exactly identical way without the original source code.
Clearly editing SVG by using plain text editors (i.e., Vim, Emacs, Notepad++) can produce elegant and light weighted images. However, for the math plots which require extensive computations, hardcoding[1] the numerical results in the SVG file will increase the difficulty for the future edits. To solve this problem, one may briefly give comments before the computer-generated data set in the SVG file (i.e., the program source code that generates the data set, the compilation instructions). In fact, most users (not computer experts) prefer to directly revise the source code of the generating program, rather than delve into the SVG tags.
