#### Description:

This attribute gives the lowest axis value to be displayed (for instance, by the astGrid method).

Type:

  Floating point.

#### Applicability

##### Frame

The default supplied by the Frame class is to display all axis values, without any limit.

##### SkyFrame

The SkyFrame class re-defines the default Bottom value to -90 degrees for latitude axes, and 0 degrees for co-latitude axes. The default for longitude axes is to display all axis values.

#### Notes:

- When specifying this attribute by name, it should be subscripted with the number of the Frame axis to which it applies.

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