Map extent margin.
// Java public int getBigExtentMargin();
// Oxygene public property BigExtentMargin : Integer read;
Used to help place a map inside a window with a small margin. Define in percent of window size (when negative) or map extent (when positive). Possible values are -50..50 where: 0 means no margin; -50 means that up 50% of a the window size will be occupied by margin; 50 means that then margin will be equal to half of extent. Default value is -10. See also BigExtent.