I really need to updated these.
I have already repeatedly improved and refined them, but have not uploaded.
old version: (same as below)
latest version: (generic 'sans-serif' font, in Inkscape / Ubuntu Linux)
size: 314 x 314, on 320 x 320 canvas (based on 90dpi render, from vector graphic)
aspect: medium, clockwise, upright (tending)