[VARIANT] = `SPACED'

A spaced $<$ARRAY$>$ is one where the data values vary linearly with array index. An example where this variant could be used is axis data, which are often equally spaced.

General-purpose applications will handle these structures. However, extra time will be expended (though probably much less than for a scaled $<$ARRAY$>$) whilst conversion to and from a $<$narray$>$ is performed. They do not contain magic-value bad pixels.

Table: Components of $<$ARRAY$>$ Structure, [VARIANT] = `SPACED'

Component Name	TYPE	Brief Description
[VARIANT]	$<$_CHAR$>$	`SPACED'
[ORIGIN(NAXIS)]	$<$integer$>$	origin of the data array
[DIMENSIONS(NAXIS)]	$<$integer$>$	dimensions of equivalent numeric array
[SCALE(NAXIS)]	$<$numeric$>$	scale factors
[BASE(NAXIS)]	$<$numeric$>$	zero points

The value of an element of the equivalent $<$numeric$>$ array would be:

$${\rm VALUE} = \sum_{i=1}^{\rm NAXIS} ({\rm BASE}(i) + (k_i-1) * {\rm SCALE}(i) )$$

where $k_i$ is the element number of the $i^{\rm th}$ dimension.

NAXIS

The number of axes in the array being represented.

[ORIGIN]

The pixel origin in each dimension. If this object is not present, each origin is assumed to be 1.

[SCALE]

The scale factor for each dimension used to convert the corresponding array index of [DATA] to its $<$numeric$>$ form. If it is not present, or is undefined, a value of 1 is assumed for each dimension.

[BASE]

The zero point for each dimension used to convert the corresponding array index of [DATA] to its $<$numeric$>$ form. If it is not present, or is undefined, a value of 0 is assumed for each dimension.

[DIMENSIONS]

The axis dimensions of the full array. Mandatory. The equivalent primitive type is the TYPE of [BASE], or if [BASE] is absent, the TYPE of [SCALE]. If both [BASE] and [SCALE] are missing, the equivalent $<$numeric$>$ array defaults to TYPE $<$_REAL$>$.