symbol sizes wrong in legend

[Meteologica S.A.]

I have the following layer to define a 4 kilometers cross:

LAYER
   ...
   SIZEUNITS meters
   CLASS
     SYMBOL "cross"
     SIZE 4000
     COLOR 0 0 0
   END
END

When i get the legend of this layer (mapserver?mode=legend) i get an ugly
legend because the size of symbol "+" is too big.

If i try:

LAYER
   ...
   SIZEUNITS kilometers
   CLASS
     SYMBOL "cross"
     SIZE 4
     COLOR 0 0 0
   END
END

I get very small symbols on the legend.

How can i do to get symbols the right size?
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