Hello, I have created a photonic bandgap crystal fiber in COMSOL using hexagonal lattice with hollow core and i want to plot the graph of electrical field distribution vs horizontal radial direction, i have already plotted the 1D graph but there i am only able to plot normE versus arc direction or reverse arc direction. If i write the expression, then what is the expression for horizontal radial direction, i have not used this in my parameters or variable section?