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[User-defined coefficients for dissipative processes](#user-defined-coefficients-for-dissipative-processes)  
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[User-defined coefficient for ambipolar diffusion](#user-defined-coefficient-for-ambipolar-diffusion)  
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[User-defined body force](#user-defined-body-force)  
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[User-defined cooling- and heating function](#user-defined-cooling-and-heating-function)  
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[User-defined cooling and heating function](#user-defined-cooling-and-heating-function)  
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[User-defined equation of state](#user-defined-equation-of-state)  
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[User-defined initial mesh refinement and refinement control](#user-defined-initial-mesh-refinement-and-refinement-control)   
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[User-defined background magnetic field](#user-defined-background-magnetic-field)   
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file `nirvana.par` below category PHYSICS SPECIFICATIONS. An example can
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be found in testproblem `/nirvana/testproblems/MHD/problem21`.
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### User-defined cooling- and heating function
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### User-defined cooling and heating function
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The modules `sourceCoolingUser.c` and `sourceHeatingUser.c` serve as
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templates for coding a user-defined cooling function,
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