Describes the sampling array dimensions associated with the binary file.
The coordinates will be generated by gnuplot. A number must be specified
for each dimension of the array. For example, array=(10,20) means the
underlying sampling structure is two-dimensional with 10 points along the
first (x) dimension and 20 points along the second (y) dimension.
A negative number indicates that data should be read until the end of file.
If there is only one dimension, the parentheses may be omitted.
A colon can be used to separate the dimensions for multiple records.
For example, array=25:35 indicates there are two one-dimensional records in
the file.
