Time-distance diagrams of two coronal waves. Panels a)−e) are obtained from the 193 Å running difference images along slices S1-S5, respectively. Panels f)−h) are obtained from the 211 Å, 171 Å, and 304 Å running difference images, respectively, along slice S4. They are fitted with linear functions, and the fitting results are indicated by different color lines. The speeds of the first wave before and after the filament channel are shown in panels with υ1b (the slopes of the green lines) and υ1a (the slopes of the blue lines). The speeds of the second wave are shown with υ2 (the slopes of the red lines). The northwest edge of the filament channel is marked by black lines.
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