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title: No SPheno output possible
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permalink: /No_SPheno_output_possible/
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---
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# No SPheno output possible
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[Category:SPheno](/Category:SPheno "wikilink") While SARAH can create valid SPheno code for many different models, there are some requirements on the model and some minor restrictions on the functionality of the resulting SPheno module. At the moment, those are
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While SARAH can create valid SPheno code for many different models, there are some requirements on the model and some minor restrictions on the functionality of the resulting SPheno module. At the moment, those are
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- <span>**Fit to low energy data**</span>: in order to perform a fit to low energy data (e.g. for fermion masses, *m*<sub>*Z*</sub>, *G*<sub>*F*</sub> and *α*<sub>*e**m*</sub>) as starting point of the RGE evaluation, the following parameters must be present in the model
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1. SM Yukawa couplings for lepton and quarks
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