– (153:0.52); (161:0.48) – (161:0.52); (170:0.48) – (170:0.52); (179:0.48) – (179:0.52); (187:0.48) – (187:0.52); (194:0.48) – (194:0.52); (200:0.48) – (200:0.52); (205:0.48) – (205:0.52); (209:0.48) – (209:0.52); (212:0.48) – (212:0.52); (230:0.48) – (230:0.52); (234.5:0.48) – (234.5:0.52); (240:0.48) – (240:0.52); (246:0.48) – (246:0.52); (253:0.48) – (253:0.52); (261:0.48) – (261:0.52); (270:0.48) – (270:0.52); (280:0.48) – (280:0.52); (290:0.48) – (290:0.52); (299:0.48) – (299:0.52); (307:0.48) – (307:0.52); (314:0.48) – (314:0.52); (320:0.48) – (320:0.52); (325.5:0.48) – (325.5:0.52); (330:0.48) – (330:0.52); (-10:0.48) – (-10:0.52); (-6:0.48) – (-6:0.52); (-1:0.48) – (-1:0.52); (5:0.48) – (5:0.52); (12:0.48) – (12:0.52); (20:0.48) – (20:0.52); (29:0.48) – (29:0.52); (39:0.48) – (39:0.52); (50:0.48) – (50:0.52); (61:0.48) – (61:0.52); (71:0.48) – (71:0.52); (80:0.48) – (80:0.52); (88:0.48) – (88:0.52); (95:0.48) – (95:0.52); (101:0.48) – (101:0.52); (106:0.48) – (106:0.52); (110:0.48) – (110:0.52); (120:0.5) node\[fill=white,circle,inner sep=0.065cm\] circle (0.02cm); (220:0.5) node\[fill=white,circle,inner sep=0.065cm\] circle (0.02cm); (340:0.5) node\[fill=white,circle,inner sep=0.065cm\] circle (0.02cm);

(115:0.45) arc (115:125:0.45); (215:0.45) arc (215:225:0.45); (335:0.45) arc (335:345:0.45);

\[Diagonals\] \[def:diagonals\] A [*diagonal of $\cZ$*]{} is a subset $X = \{ x_0,x_1 \} \subset \cZ$ where $x_1 \not\in \{ x_0^-,x_0,x_0^+ \}$. If $Y = \{ y_0,y_1 \}$ is another diagonal, then $X$ and $Y$ [*cross*]{} if $x_0 < y_0 < x_1 < y_1$ or $x_0 < y_1 < x_1 < 