def set_lines(ax):
    for l in ax.lines:
        l.set_linestyle('--')
        l.set_linewidth(0.6)
        l.set_color('white')
        l.set_alpha(0.7)
    for l in ax.lines[1::3]:
        l.set_linestyle('-')
        l.set_linewidth(1.3)
        l.set_color('black')
        l.set_alpha(0.8)
def set_lines(ax):
    for l in ax.lines:
        l.set_linestyle('--')
        l.set_linewidth(0.6)
        l.set_color('white')
        l.set_alpha(0.7)
    for l in ax.lines[1::3]:
        l.set_linestyle('-')
        l.set_linewidth(1.3)
        l.set_color('black')
        l.set_alpha(0.8)