Dear Meep users,
  I defined a dispersive material as follows:
    (define chromium  
    (make dielectric 
        (epsilon 1)
        (polarizations 
            (make polarizability
                (omega 0.2405)
                (gamma 0.0714)
                (delta-epsilon 10)))))
While running in Meep, 'ERROR: Unbound variable: delta-epsilon' appeared.
However, there is similar definition in Meep archives.
http://article.gmane.org/gmane.comp.science.electromagnetism.meep.general/2323/match=delta+epsilon
I don't know where is wrong and what's the meaning of delta-epsilon. Your 
suggestion will be appreciated.

Best wishes,
feng



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