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The format string supported by the format (-f) operator is a string that contains format items. Each format item takes the form of:
{index[,alignment][:formatString]}
index represents the zero-based index of the item in the object array following the format operator.
alignment is optional and represents the alignment of the item. A positive number aligns the item to the right of a field of the specified width. A negative number aligns the item to the left of a field of the specified width.
PS > ("{0,6}" -f 4.99), ("{0,6:##.00}" -f 15.9)
4.99
15.90
formatString is optional and formats the item using that type’s specific format string syntax (as laid out in Tables D-1 and D-2).