Knit the s on needle 1 onto needle 4. Turn. Purl across 30 s. Turn. Knit today's chart. The heel portion is knitted flat. The turning point is marked with a red line in the pattern.
After knitting chart, pick up 16 s on each side of the heel. Knit 5 s in order to move the starting point to the center of the heel. You now have a total of 75 s. Distribute 19/18/19/19.