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Fig. 1


Running-difference images of STEREO/EUVI-A 195 Å and SDO/AIA 193 Å showing the EUV wave formation (accompanied by EUV bubble) for (a) 03:40:30 UT; (b) 03:45:30 UT; (c) 03:50:30 UT; (d) 03:55:30 UT; (e) 04:00:30 UT; (f) 03:42:12 UT; (g) 03:45:36 UT; (h) 03:47:48 UT; (i) 03:50:24 UT; and (j) 03:52:48 UT. The slices A and B, shown in (g), represent the directions along which the speed of the EUV wave was determined.

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