960gs Sass arguments

Question

I'm currently in the process of learning 960gs using sass / compass, but I'm confused as to what the "$n" is in the following code and how to use the arguments.

$ninesixty-gutter-width: 20px !default

$ninesixty-grid-width: 960px !default

$ninesixty-columns: 12 !default

$ninesixty-class-separator: "_" !default

=grid-container
  margin-left: auto
  margin-right: auto
  width: $ninesixty-grid-width

=grid-width($n, $cols: $ninesixty-columns, $gutter-width: $ninesixty-gutter-width)
  width: $ninesixty-grid-width / $cols * $n - $gutter-width

Answer 1

According to the docs for that plugin...

"N is the number of grid columns to span as in grid_N or push_N with the original 960 Grid System framework."