Phase relations between the 5 min oscillations at 1700 Å (thin) and 304 Å (thick) levels. The signals were filtered in the 0.8 mHz band centered at 3.3 mHz. a) The points for the different layers were selected accounting for the trajectory inclination, so that the filtered oscillation wave trains in the points showed the maximal correspondence (correlation coefficient is 0.7). b) The signals from the points located above each other at the line of sight at the point marked in the 1700 Å panel show less correspondence (correlation coefficient is 0.35).