code of standard practice for steel buildings

huangyhg

code of standard practice for steel buildings
code of standard practice for steel buildings and bridges.
march 7, 2000:
section 7.13.1.2 (b):
for a member that consists of an individual, straight shipping piece that connects to a column, the variation in the distance from the member working point to the upper finished splice line of the column shall be equal to or less than plus 3/16 in and minus 5/16 in.
question:  
1.  what does plus 3/16 in and minus 5/16 in mean?
2.  where is the finished splice line of the column?