In the next section on Error Analysis, standard methods are described for determining errors on measured quantities or the combination of measured quantities. Here we mention general stylistic guidelines for proper reporting of errors. First, absolute errors carry the same units as the affected physical quantity. Errors should be stated with at MOST two significant figures.
Any extra digits are completely meaningless.
Quoting any more significant figures would be wrong. When dealing with very large or very small numbers, one should use exponential notations. In such cases, errors should be reported with the same power of 10 as the physical quantity. Measurements presented in a plot need to always be accompanied by the proper error bars. Measurements reported in a table need to always be accompanied by the proper errors and units, although errors and units can be specified in the column header if they are the same for the entire column.