Time series of Fe charge-state distributions (first panel) for the highlighted time period from Fig. 2, that is, DoY 4.5−6.5 in 2004, in one-hour time resolution. In black, the average charge-state (that is, ) is shown in units of the elementary electric charge e.Each charge-state distribution is normalized to the sum. Below, the solar wind proton speed (second panel) and proton density (third panel) are given as reference. In the bottom panel the ratio n_{O^{7 +}}/n_{O^{6 +}} is shown as well.The threshold value between Fe-cool and Fe-hot wind is shown as a horizontal dashed line and the transition between Fe-hot and Fe-cool coronal-hole wind is marked with a vertical black line in all panels.