V10/vol2/cip/arcs.pic

.PS
scale=200
box invis ht 200 wid 420 with .nw at 0,200
"2" at 320,202
"2" at 0,95
"1" at 100,195
"1" at 200,102
arc from 100,200 to 0,100 at 100,100
arc from 220,100 to 320,200 at 320,100
.PE