Li, Z., and Z. Qin. 2014. “Spacing and Alignment Rules for Effective Legend Design.” Cartography and Geographic Information Science 41 (4): 348–362. http://dx.doi.org/10.1080/15230406.2014.933085
When the above article was first published online, a sentence was missing from the beginning of the acknowledgements section. This is added below:
Many thanks are given to the Hong Kong Polytechnic University for the financial support [G-U686 and 1.34.37.87T5].
Furthermore, the second point in the conclusion should have been revised as follows:
Spacing rule g (spacing between adjacent lines of features and between a symbol and its description) is more important than the spacing rules a (spacing between letters of a word) and h (spacing between adjacent lines of features), which in turn are more important than spacing rules b (spacing between words and between letters), d (spacing between words in different descriptions), c (spacing between words in a description), e (spacing between a symbol and its description and between words), f (spacing between a symbol and its description), and i (surrounding spacing of each group and spacing between adjacent lines of features);
The authors apologize for this error.