Bottom edge detection for left column of M (x=210 to 340):
x=210: edge at y=1073 (v0=80, v1=13)
x=230: edge at y=1073 (v0=98, v1=39)
x=250: edge at y=1073 (v0=96, v1=39)
x=270: edge at y=1073 (v0=95, v1=44)
x=290: edge at y=1073 (v0=91, v1=41)
x=310: edge at y=1073 (v0=91, v1=39)
x=330: edge at y=1073 (v0=93, v1=40)