importmatplotlib.pyplotaspltkw=dict(usetex=True,fontsize=40,bbox=dict(boxstyle='round,pad=0',fc='lightsteelblue',ec='none'))plt.axhline(y=0.7)plt.annotate('A',xy=(0.3,0.7),**kw)plt.annotate(r'$A$',xy=(0.4,0.7),**kw)plt.annotate(r'$^{\tiny 1}A$',xy=(0.5,0.7),**kw)plt.annotate(r'$^{\tiny 1j}A$',xy=(0.65,0.7),**kw)plt.axhline(y=0.4)plt.annotate('A',xy=(0.3,0.4),va='bottom',**kw)plt.annotate(r'$A$',xy=(0.4,0.4),va='bottom',**kw)plt.annotate(r'$^{1}A$',xy=(0.5,0.4),va='bottom',**kw)plt.annotate(r'$^{1j}A$',xy=(0.65,0.4),va='bottom',**kw)plt.show()