The red line is for the carbon foam sample containing alpha iron oxide particles. 15 wt. % Iron chloride hexa hydrate was added in the recipe of carbon foam and after carbonization treatment, it formed iron oxide particles homogeneously covering the porous body. The black curve is for the carbon foam containing zero iron chloride in the recipe. The question is that the red curve is zigzag and is it possible in theory? Is it due to instrumental fault?