.PS
cct_init

# Usual defs...
qrt=dimen_/4;
hlf=dimen_/2;
dim=dimen_; 

L1:line right_ 50mm__
move down_ dim
line left_ 50mm__

"$Z_0; \gamma$" at L1.center+(0,-hlf)

move to L1.start
gap(down_,1)
move to L1.end
gap(down_,1)

move to L1.start+(-qrt,-hlf)
line <- left_ hlf then down_ qrt
"$Z_\text{in}$" at Here+(0,-2mm__)

move to L1.end+(0,-hlf)
"$Z_L=\infty$"

"\tiny ocline" at (L1.end.x,-15mm__)
.PE