def axis_labels(x, y, axlabelfontsize=None, axlabelfontname=None):
    plt.xlabel(x, fontsize=axlabelfontsize, fontname=axlabelfontname)
    plt.ylabel(y, fontsize=axlabelfontsize, fontname=axlabelfontname)
    # plt.xticks(fontsize=9, fontname="sans-serif")
    # plt.yticks(fontsize=9, fontname="sans-serif")