$($e$.$g$.,$ laser, flame, etc.$)$ is modelled as the Gaussian distribution.

$q(r)=\frac{2P}{r_o^2}$exp$(-\frac{2r^2}{r_o^2})$

$orq(x,y)=\frac{2P}{r_o^2}$exp$[-\frac{2(x^2+y^2)}{r_o^2}]$

where $P$ is the power and $r_o$ is the radius of heat source.

Suppose that we have a Gaussian heat flux distribution with $P=5$

ind $r_0=1$ and measure the heat flux along with $x$ axis