(lemacs.info)ForIndent Num

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Line Numbers and Continuation

   If a number is the first non-whitespace in the line, it is assumed
to be a line number and is moved to columns 0 through 4.  (Columns are
always counted from 0 in GNU Emacs.)  If the text on the line starts
with the conventional Fortran continuation marker `$', it is moved to
column 5.  If the text begins with any non whitespace character in
column 5, it is assumed to be an unconventional continuation marker and
remains in column 5.

   Line numbers of four digits or less are normally indented one space.
This amount is controlled by the variable `fortran-line-number-indent',
which is the maximum indentation a line number can have.  Line numbers
are indented to right-justify them to end in column 4 unless that would
require more than the maximum indentation.  The default value of the
variable is 1.

   Simply inserting a line number is enough to indent it according to
these rules.  As each digit is inserted, the indentation is recomputed.
To turn off this feature, set the variable
`fortran-electric-line-number' to `nil'.  Then inserting line numbers
is like inserting anything else.

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