[NTG-context] How to adjust the sistance between a letter and subscript

Hi, In the following example, the distance between a letter ${\cal T}$ and its subscript is too big. It is not an error, but it looks a little bit strange. How to reduce it for a good looking? Thank you. Best regards, Dalyoung ***** \starttext Compare the distance between a letter and its subscript of the following example. \startformula T_X \quad {\cal T}_X \quad T_Y \quad {\cal T}_Y \stopformula \stoptext *****