Why is here a difference between tolerances of the yellow marked dimensions?What is your intention with the surface profile tolerance. For this depiction I understand that it is applied to the median plane of dimension 16 (see attached presentation “F< Datum and Tolerance on center line or surface.ppt” for background information). This does not make sense to me. If this should be the tolerances for 68.8 I suggest like follows (a surface profile tolerance might also be ok if you place it like shown below but for a plane surface I usually prefer a positional tolerance).What do the black surfaces in the picture below mean?Many tolerances are 0.5 or even smaller. please 3 digit precision for adjusting dimensions.For the precision of other TEDs you have to consider the applicable tolerance