def integral(x,c1,c2,T): 
  return ((c1*0.98)/(x**5))*(1/((np.e**(c2/(x*T)))-1))

resut,err = integrate.quad(integral, 3, 5, args=(c1,c2,T))

plt.figure(1) 
ax1 = plt.subplot(211)
plt.sca(ax1) 
plt.plot(fi,functionI(fi,0.5,5,1,e0),label='n=5,ks=0.5')
plt.legend(loc='upper right',bbox_to_anchor = (0.9, 0.9))
plt.xlabel(u'ψ/rad') 
plt.ylabel(u'I/(W/sr)')

ax2 = plt.subplot(212)
plt.sca(ax2) 
plt.plot(fi,functionI(fi,0.5,5,1,e0),label='n=5,ks=0.5')
plt.legend(loc='upper right',bbox_to_anchor = (0.9, 0.9))
plt.xlabel(u'ψ/rad') 
plt.ylabel(u'I/(W/sr)') 

plt.subplots_adjust(wspace=0.5, hspace=0.5) 
plt.show()