How to change font size of the scientific notation in matplotlib?

Question

I want to make a plot with large font size, I can change all font sizes easily except when I use scientific notations in the axis label. I have searched and tried but haven't found a way to change the size of the scientific appendix. See this figure:

1

In this figure, "1e-4" is just too small compared to other texts and labels. These codes are relevant in producing the enlarged fonts used in this figure:

ax.tick_params(labelsize=24)
ax.yaxis.get_major_formatter().set_powerlimits((0, 1))
ax.text(0.3,4.9e-4,'(a)',va='top',fontsize=24)
plt.xlabel('$r$ (a.u.)',fontsize=24)
plt.ylabel('Probability',fontsize=24)

By the way, how to change "1e-4" into "x1e-4"? Thanks!

Answer 1

You want to change the fontsize of the offset_text from the yaxis. You can do that with this line:

ax.yaxis.get_offset_text().set_fontsize(24)

Or equivalently:

ax.yaxis.offsetText.set_fontsize(24)

Answer 2

I use ax.yaxis.set_major_formatter(ScalarFormatter(useMathText=True)) for changing 1e-4 to x10^-4