uniform components

[morphmet]

Dear Morphometricians
Would you please help me in understanding the meaning
of uniform components? I know these describe how much
a specimen is stretched on X or Y axis.
I also know we extract these components after
superimposition and it means size is eliminated before
computing uniform components.
What would be the interpretation, if a specimen has
bigger values for both U1 and U2? It seems affine
stretching in both horizontal and vertical directions
should present bigger size and affine contraction in
these tow directions should present smaller size. So
if the size has been eliminated before, what would be
the interpretation? I mean whats the difference
between a specimen which has low values for U1 and U2
and a specimen which has high values for both.
Any comments would be appreciated in advance 
Sincerely yours
Roohollah 

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