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Logo and line art targets

In the release notes of Vuforia 2.5 you mentioned that you enhanced the recognition and tracking capabilities of the engine so that it is now possible to detect and track also line art targets and logos. Are there any special flag that I should use in the SDK to enable this feature? Is also the target manager engine on your website updated to detect also these type of (line) features? Or perhaps I should use some specific target type? I uploaded several logos to the target manager. The "show features" option target manager still shows only the corner-type features and they were ranked poor (zero) even if visiually they do not look less complex than that one of your introductional video for vuforia 2.5 (for example the exit sign).