Dear list, I am unhappy with how some fonts kern particular subscripts. For example in the default Latin Modern, subscripts to the Greek capital gamma could use some negative kerning. Because I can't (and don't want to) fix the font, I thought that I could patch the font on-the-fly in ConTeXt. The usual approach with fonts.handlers.otf.addfeature works well in math mode, but does not extend into subscripts (MWE below). Is there a method to adjust subscript kernings? Could this be done using mathkerns? Latin Modern doesn't have any but maybe they can be added on the fly. Cheers, Henri --- \startluacode fonts.handlers.otf.addfeature { type = "kern", name = "kern", data = { [0x0393] = { [0x0030] = -200 } } } \stopluacode \setupbodyfont[modern] \starttext $\Gamma0$ % works fine :) $\Gamma_0$ % doesn't work :( \stoptext