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fig, ax1 = plt.subplots()
ax1.plot( x, y1, 'b')
ax1.set_ylim([y1min,y1max])

ax2 = ax1.twinx()
ax2.plot(x, y2, 'r')

ax2.ticklabel_format(axis='y', style='sci', scilimits=(-2,2))
ax2.set_ylim([y2min,y2max])

fig.tight_layout()
plt.show()