Simple two-component velocity model created by applying our linear velocity estimates based on the line core and line wings of Ca II K. We transition from the photospheric velocity estimate to the chromospheric velocity estimate at log(τ) =  −3.5 by means of an arctangent function. This velocity model was used together with a FAL-C atmosphere as the initial guess for the inversion code. From left to right the scaling functions used to compose the velocity model (a), the chromospheric velocity estimate (b) and the photospheric velocity estimate (c).