Prints message to screen indicating the use of PGFPlots and its
    libraries.

def _print_pgfplot_libs_message(data):
    """Prints message to screen indicating the use of PGFPlots and its
    libraries."""
    pgfplotslibs = ",".join(list(data["pgfplots libs"]))
    tikzlibs = ",".join(list(data["tikz libs"]))

    print(70 * "=")
    print("Please add the following lines to your LaTeX preamble:\n")
    print("\\usepackage[utf8]{inputenc}")
    print("\\usepackage{fontspec}  % This line only for XeLaTeX and LuaLaTeX")
    print("\\usepackage{pgfplots}")
    if tikzlibs:
        print("\\usetikzlibrary{" + tikzlibs + "}")
    if pgfplotslibs:
        print("\\usepgfplotslibrary{" + pgfplotslibs + "}")
    print(70 * "=")
    return