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Thank you Stephane:)

I must agree that this was one of the characteristics which sold me on this too. The confusion I had, as Janet pointed out, was caused by looking at images from another site which seemed to suggest the opposite of this. I have learnt a great lesson. There is a lot of info on the web and some of this is mis-leading. I try to get positive (where this is humanly posible from photographs!) IDs before classifying them in my collection. I am very confident with these from this site and shall always use this expert help I get here to learn.