Another Group mystery

[Graham Samuel]

I have two rectangular images each with a height of 126 pixels. I align 
them so that the tops (and therefore the bottoms) of the images are at the 
same level. I group them, and the group is 134 pixels high. There is no 
other image or graphic in the group. Can anyone say why this should be, and 
what if anything I can do about it? If I did something wrong, what was it?

TIA

Graham

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Graham Samuel / The Living Fossil Co. / UK & France