[NTG-context] integral symbol

Hello, The integral symbol is little in inline math mode. Is it possible to have it bigger ? thank you, Fabrice \definetypeface [mainface] [rm] [serif] [palatino] [default] [encoding=texnansi] \definetypeface [mainface] [ss] [sans] [helvetica] [default] [encoding=texnansi] \definetypeface [mainface] [tt] [mono] [palatino] [default] [encoding=texnansi] \definetypeface [mainface] [mm] [math] [palatino] [default] [encoding=texnansi] \setupbodyfont[mainface,11pt] \starttext L'aire hachurée se note \math{\int_1^3 k(x)\mathop{dx}}. L'aire hachurée se note : \startformula \int_1^3 k(x)\mathop{dx}. \stopformula \stoptext