如何调整plt.plot()线的粗细,linewidth

ax.plot(np.r_[0,100],1.2*np.r_[0,100]+0.2,color = "C1",linewidth=3.0,label='GT')
ax.plot(np.r_[0,100],w*np.r_[0,100]+b,color = "C2",linewidth=3.0,label='fit')

linewidth