What I actually try to do is to observe the electric field distribution from (0,Φ',z') to (a,Φ',z') where a is the radius of waveguide for constant Φ',z' at start and end points.
If I draw a line on Waveport, I can observe the electric field distribution along the line.
Even if I draw my observation-lines on sheets, i cannot obtain any data.
Yes, lines are of infinetisimally thickness but i can use it on waveport to observe electric field. Also, i cannot observe on any sheet (actually i do not need to observe on sheet, just to make it clear, i said.)
regards