My goal of writing lvl_builder is to let users don’t worry about the calculations or arrangement. (I wish to make the plotting a fun and easy task). The spirit of lvl-builder is similar to using Latex, one just inputs very minimal information for level and gamma, and the program does all the hard work for you. Meanwhile, the lvl_builder uses the xmgrace, one of very popular and powerful scientific tool, as the rendering tool, and so user can get the full control of "ALL" the details.

Still thinking about the input job is too tedious? I have another small program, NNDCparser, which can turn the data at the NNDC website into the input file format for 'lvl_builder' so that you can have a plot in just a second. Of course, the presentation will be raw, but the adjustment is very quick.