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\input{luaotfload.sty}
\directlua {
local function patch(fontdata)
local mc = fontdata.MathConstants
local em = fontdata.parameters.units
local sz = fontdata.parameters.size
if fontdata.psname == "CambriaMath" and mc then
mc.DisplayOperatorMinHeight = 2800 / em * sz
end
end
luatexbase.add_to_callback("luaotfload.patch_font", patch, "cambria.domh")
}
\font\4={name:Cambria Math:mode=base;script=math} at 10pt
\font\5={name:Cambria Math:mode=base;script=math;ssty=1} at 7pt
\font\6={name:Cambria Math:mode=node;script=math;ssty=2} at 5pt
\textfont4=\4 \scriptfont4=\5 \scriptscriptfont4=\6
$$
\Umathchar"1"4`∫
\Umathchar"1"4`∑
$$
\bye
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