Enclose mathematical expressions in dollar signs to use Greek letters, subscripts, superscripts, and other symbols in plot labels:
ba.plot_curve(result, xlabel=r"$\alpha$ (deg)", ylabel=r"$R$")
MatPlotLib’s built-in math-text renderer handles these expressions without
a LaTeX installation. Python raw strings (r"...") keep backslashes
such as \alpha intact.
To use an external LaTeX installation instead, enable it before plotting:
ba.plt.rcParams['text.usetex'] = True
Alternatively, set the environment variable USETEX=True before importing
BornAgain. External rendering requires LaTeX and backend-dependent tools;
see MatPlotLib’s LaTeX guide for installation details.