Multiline techniques assuming similar line profiles have become a standardtool in stellar astronomy for increasing the signal-to-noise ratio (SNR) ofspectropolarimetric measurements. However, due to the widely-used weak fieldapproximation their benefits could not so far be used for solar observations,where a large variety of Stokes profiles emerge from local magnetic fields andmeasuring weak fields in the quiet Sun remains a challenge. The methodpresented here permits us to analyze many lines with arbitrary Zeeman splittingand to simultaneously deploy Stokes IQUV spectra to determine a common lineprofile with the SNR increased by orders of magnitude. The latter provides avaluable constraint for determining separately field strengths for eachcontributing absorber. This method represents an extension of our recentlydeveloped technique of Nonlinear Deconvolution with Deblending (NDD, Sennhauseret al. 2009), which accounts for the nonlinearity in blended profiles. Equippedwith all those abilities, ZCD is the perfect tool to further increase theinformative value of high-precision polarimetric observations.
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