I can confirm Linz Hörsching (many of the German planes found were marked with a red cross on the rudder (see e.g. a color photo of the tail of a Bf 109 found at Linz Hörsching in my book 'Captured Eagles'). I assume the captors marked those that could be scrapped.
Below is a better scan of that photo. Does anybody have an idea what the color of the rudder was? It was not white. Possibly RLM 76 or a light grey? I don't think it was yellow.
