[NTG-context] overbar in math mode is asymmetric over "F"

mkern3\onemuskip}} \stoptext I wish to have an overbar that extends over the exact boundingbox of the letter or sequence of letters. How can this be done in context without manual fixing? Thnk you, Bernd

[NTG-context] perfect centering of layers in a text area

Hello, I'm converting some context from mkii to mkiv. Since the definelogo is depreciated I try to use layers to get the same result. The problem in the example below is, the text in the header - which is a table - is not perfectly centered with respect to the bottomframe. What is the reason