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Minimal example for drawing an isolated axis
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This is the basic example of how to draw an axis alone -- without the whole
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graph. It serves to simplify the following examples. ... The function
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`pathaxis` from the `graph.axis` module takes a path and returns a canvas which
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contains the drawn axis.
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In contrast to the typical usecase of graphs containing data, we here have to
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provide the range explicitly (using the `min` and `max` arguments). For real
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graphs the range of an axis, of course, is adjusted automatically, although you
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can still set minimal and/or maximal values to force a certain axis range.