In BF Sample 11.8 (Section 11 Tables and Related Columns), the number indicator is aligned and in some of the entries is followed by a space. Could you explain this usage and When is it appropriate to use a space after the number indicator
The spacing as in 11-8 is used when the numbers are aligned for calculation. This spacing (between the numeric indicator and the following number) is not required when the numbers are aligned by place value.