Original files are stored locally for offline viewing. Photographs are shown whole and centered; display sizes may change. The masking and domain-shift examples add teaching overlays or darken the display; the original files remain unchanged. Photos and any displayed adaptations retain the licenses listed below.

Photograph by Max Ronnersjö · Source and title · CC BY-SA 3.0.
Original file shown whole. Some examples darken the display or add separate teaching overlays.

Photograph by Von.grzanka · Source and title · CC BY-SA 3.0.
Original file shown whole. Some examples darken the display or add separate teaching overlays.

Photograph by Melbelle · Source and title · CC BY-SA 3.0.
Original file shown whole. Some examples darken the display or add separate teaching overlays.

Photograph by Shixart1985 · Source and title · CC BY 2.0.
Original file shown whole. Some examples darken the display or add separate teaching overlays.
The diagrams are original teaching graphics. Part 1 illustrates a numerical output scale. The original numerical charts are explored in Part 2 and credited in the source map.