Detectable density ranges of 10 X-ray WA components in the unobscured state of NGC 3783. The 10 WAs are marked in red. Upper black points and line: outflow velocity equals the escape velocity. For higher densities, winds cannot escape i.e., they are failed winds as shown in the light azure shaded region. Lower black points and line: the thickness of the wind equals its distance to the core. For lower densities, no solution exists, i.e., forbidden region shown in the yellow region. Red vertical solid lines: the detectable density range by the tpho-delay method for all 10 X-ray WAs. The upper limit: lag equals 10⁴ s. For higher densities, lags are shorter and more difficult to measure due to photon statistics. The lower limit: relative variations of the charge of Fe ions is 10%. For lower densities, variations become too small to measure. Navy stars and lines with labels 1a–3: density measurements or lower limits from Gabel et al. (2005). ξ values converted for models with the SED of Mehdipour et al. (2017). Rectangular boxes: regions where density-sensitive X-ray lines can be used to measure densities.