Line thickness inconsistency

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While creating a schematic in Xara Xtreme, minipulating it's connective lines seems to produce predictably consistent results (in terms thickness).

If the same graphic composition is placed in a Flash (animation) document, the line widths are visually inconsistent ... depending on how I manipulate those lines with Xara Xtreme commands.

It doesn't seem to matter how wide the lines are (connecting lines in the examples provided are set to be 0.5pix)

Might someone be able to explain what's happening?

mercí =)