Imperia sock machine
84 needle cylinder
Needle in every other slot - 42 needles.

Pattern;
Tension 0.5
10rnds
Tension 1.5
10rnds
Hang hem
Tension 2.
60rnds.
Heel in contrast 1up2down down to 9sts.
Foot
55 rounds
Toe in castrast as heel.

Photos show how the heel looks while on the machine.
Straight off the machine.
After the stitches are tugged to even out the stitch shape.
Comparison photo with washed sock (left) and unwashed sock (right) to show that after a soak those uneven stitch gaps close up.