fontlabel_size = 10.5
params = {'backend': 'wxAgg', 'lines.markersize': 2, 'axes.labelsize':
    fontlabel_size, 'text.fontsize': fontlabel_size, 'legend.fontsize':
    fontlabel_size, 'xtick.labelsize': tick_size, 'ytick.labelsize':
    tick_size, 'text.usetex': True, 'figure.figsize': fig_size}
Set Font Properties to Tick Labels with Matplot Lib