Plot the interpolation graph in 3.5a

Hi,

I am using COMSOL 3.5a and solving heat transfer (solid-liquid interface) problem for 1hr.

Generally, to plot the graph,I used file-export-current plot and values are open and finally I plot the graph (solid-liquid interface) in excel.

But, how to do the interpolation of graph (as it is not smooth in nature).

Thanks in advanced,

Vinay Patel