Plage spectral signatures in the Ca II 8542 Å line. Top: monochromatic images acquired in the wing (Δλ = −880) mÅ and in the core of the line. Middle: example plage spectra in Stokes I extracted from the locations indicated in the upper panels with the same color coding. For comparison, we have also included a quiet-Sun profile colored in gray. Bottom: Stokes I_λ (upper) and V_λ/I_λ spectra (lower) along the slit indicated in the top panels of the figure.