Finding right slope of V (x=580 to 880):
x=600: edge at y=624 (v0=107, v1=32)
x=660: edge at y=581 (v0=68, v1=33)
x=800: edge at y=384 (v0=96, v1=31)
x=820: edge at y=369 (v0=99, v1=31)
x=840: edge at y=354 (v0=107, v1=25)