Version 4
SHEET 1 880 680
WIRE 160 96 160 64
WIRE 160 208 160 176
FLAG 160 208 0
FLAG 160 64 flat
SYMBOL voltage 160 80 R0
SYMATTR InstName V1
SYMATTR Value {flat(20)}
TEXT 144 -24 Left 2 !.step param  x 1 50 1
TEXT 144 -56 Left 2 !.op