... edges

A similar calculus shows that convergence is only quadratic.

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... tools

An easy-to-use Fortran 90 package nammed APPLawD (an acronym for "Accurate Potential for Power Law Disks'') is available upon request to the authors. APPLawD can be downloaded at the following address: www.obs.u-bordeaux1.fr/radio/JMHure/intro2applawd.html

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