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By default, the output value is left aligned and shown with the minimum
width necessary for the specified (or default) precision.  If a field
width greater than this is specified, the value shown is right aligned,
and padded on the left with enough spaces to provide the specified field
width.  A width specification is typically used with fixed-point decimal
to have columns of numbers align at the decimal point; this arguably is
less useful with units than with long columnar output, but it
may nonetheless assist in quickly assessing the relative magnitudes of
results.  For example, with the format ‘%12.6f’,
You have: km
You want: in
        * 39370.078740
        /     0.000025
You have: km
You want: rod
        *   198.838782
        /     0.005029
You have: km
You want: furlong
        *     4.970970
        /     0.201168