See Expression Elements

Expression Value: Longitude Format _graticuleFormatLon$

Expression Element: Built-in Properties

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Longitude format

The format string for the longitude Graticule label text at this level, using the following format specifications:

Expression Syntax: _graticuleFormatLon$

%d or %D	Print the degrees (%D appends a degrees symbol °)
%m or %M	Print the minutes (%M appends a ')
%s or %S	Print the seconds (%S appends a ")
%c or %C	Print the direction (N, S, E, or W)

%d, %D, %m, %M, %s and %S can be modified to print fixed width and precision (like the C printf function), e.g.: %4.2s   

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