What are the Di parameters in the power grid model?

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The D_{i} parameters in the power grid model are the damping coefficients for the different rotors; there is a typo in the equations (slide 9 of Lecture 2-1), as each rotor has its own damping coefficient (the first equation notation is D_{1}, the second has to be corrected to D_{2}).

--Elisa 15:11, 8 October 2007 (PDT)