Specifying a Separator for Reference Ranges
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Reference ranges are normally created with your computer's standard separator (either a comma or a semicolon). Alternatively they can be specified with a separator of your choosing.
For example, if you define the follow parameter.
$a[3,10] will produce 10, 13, 16, 19, 22, 25, 28, 31
You might like to separate the elements with a + sign to show a series. This can be defined by
$a[3,10,+] or $a[3,10,"+"] (the quotation marks are optional)
Both of these expressions will result in the following