numberblock—number block with numbers to be charted. If black and white, numbers should be between 0 and 1 and are converted to 64 grey levels. Use numbers/max(numbers) to get fractions. If color, numbers should be between 0 and 7. Colors are: x<=0 — white; 0<x<=1 — yellow; 1<x<=2 — cyan; 2<x<=3 — magenta; 3<x<=4 — red; 4<x<=5 — green; 5<x<=6 — blue; 6<x — black.
contour creates a block containing a contour chart. To change its appearance, click again on the chart and answer the resulting dialog.