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tokens: Acknowledgements Financial support by the Spanish Ministry of Economy and Competitiveness and the European FEDER Fund through projects AYA2014-60476-P (Solar magnetometry in the era of large solar telescopes) and AYA2014-60833-P (Spectropolarimetry: a window to stellar magnetism) is gratefully acknowledged. The German VTT is operated by the Kiepenheuer-Institut für Sonnenphysik at the Spanish Observatorio del Teide of the Instituto de Astrofísica de Canarias (IAC). This paper made use of the IAC Supercomputing facility HTCondor ( http://research.cs.wisc.edu/htcondor/ ). NSO/Kitt Peak FTS data used here were produced by NSF/NOAO.