Version 4
SHEET 1 1108 680
WIRE 144 48 144 16
WIRE 144 144 144 128
WIRE 96 352 96 320
WIRE 384 352 384 320
WIRE 672 352 672 320
WIRE 96 448 96 432
WIRE 384 448 384 432
WIRE 672 448 672 432
FLAG 144 144 0
FLAG 144 16 out
FLAG 96 448 0
FLAG 96 320 out1
FLAG 384 448 0
FLAG 384 320 out2
FLAG 672 448 0
FLAG 672 320 out12
SYMBOL voltage 144 32 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PWL file={F}
SYMBOL voltage 96 336 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PWL file=pwl1.txt
SYMBOL voltage 384 336 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PWL file=pwl2.txt
SYMBOL bv 672 336 R0
SYMATTR InstName B1
SYMATTR Value V=IF({F}==1,V(out1),V(OUT2))
TEXT 32 -112 Left 2 !.step param F list 1 2
TEXT 32 -144 Left 2 !.tran 60
RECTANGLE Normal 336 176 16 -64
RECTANGLE Normal 1104 512 16 208