[XeTeX] Package Bidi Error

[@@]

Hi

Why the Scale option below don't produce the same output?

\newfontfamily\arabicfont[Script=Arabic,Scale=2.4]{Scheherazade}


[image:
?ui=2&view=att&th=126eaa0d2d2548ad&attid=0.1&disp=attd&realattid=ii_126eaa0d2d2548ad&zw]

Regards
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