* @demlmax demonstrates 
* the shapes of lmax and
* lmin filters
read singlept a
copy a b 100 100 
lmax b c 2 11
bd c
copy a b 80 100
lmax b c 4 13
bd c
copy a b 60 100
lmax b c 6 13
bd c
copy a b 40 100
lmax b c 8 13
bd c
copy a b 20 100
lmax b c 10 13
bd c
copy a b 255 100
lmax b c 12 13
bd c
copy a b 235 100
lmax b c 14 13
bd c
copy a b 215 100
lmax b c 16 13
bd c
copy a b 195 100
lmax b c 18 13
bd c
copy a b 170 100
lmax b c 20 13
bd c
copy a b 145 100
lmax b c 22 13
bd c
copy a b 100 60
lmax b c 24 13
bd c
copy a b 60 60
lmax b c 28 13
bd c
copy a b 20 60
lmax b c 32 13
bd c
copy a b 235 60
lmax b c 36 13
bd c
copy a b 195 60
lmax b c 40 13
bd c 
copy a b 155 35
lmax b c 44 13
bd c
copy a b 80 0
lmax b c 48 13
bd c
copy a b 20 0
lmax b c 56 13
bd c
copy a b 205 0
lmax b c 64 13
bd c
copy a b 45 175
lmax b c 72 13
bd c
copy a b 220 175
lmax b c 80 13
bd c