Two large parallel plates having a gap of 10 mm in between them are maintained at temperatures T1 = 1000 K and T2 = 400 K. Given emissivity values, e2 = 0.25 and Stefan-Boltzmann constant s=5.67 ´ 10–8 W/m2-K, the heat transfer between the plates (in kW/m2) is __________