Help me with calibre LVS: getting negative value

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jodenma

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calibre LVS for help

now i use calibre do LVS, because my circiut have some mos transistor which is L larger than W,so the LVS output file get the value is negative.
eg:
in circuit NMOS w=1.5u L=20u
in calibre layout.spi NMOS W=1.5u L=-21u

pls help me ,
 

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