[Description] Gets the recommended white space below the black box. [Name] 
BottomSideBearing
B a s e l i n e
B l a c k B o x H e i g h t
B l a c k B o x W i d t h
B o t t o m S i d e B e a r i n g
L e f t S i d e B e a r i n g
M e t r i c s
R i g h t S i d e B e a r i n g
T o p S i d e B e a r i n g