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IDF syntax > IDF attributes:
ALPHA is a translucency value that may be assigned in an INCLUDE element, or a named GROUP within the INCLUDE tag, when used in to make an overlay by specifying CACHE="YES".
where percentage is a real number from 0 (transparent) to 100.00 (opaque). E.g.:
<INCLUDE GROUPNAME = "mutedoverlay" CACHE="YES" ALPHA="33.33"/>