Dear list, I encountered some cases where the actual time interval between two neighbouring measurements being much larger than the scheduled value. Have you witnessed similar cases? I appreciate explanations on underlying reasons. Here goes an example: from ripe.atlas.cousteau import AtlasResultsRequest filters = dict(msm_id=1010, probe_ids=[16981], start=1470055258, stop=1470056217) is_success, results = AtlasResultsRequest(**filters).create() if is_success: for mes in results: print mes.get('timestamp', -1) The above code requests some built-in ping measurements (240s interval) made by probe 16981 and prints their timestamps. See below for the execution result: 1470055259 1470055499 1470055978 1470056216 Four measurements are retrieved within the given time range. I noticed that time interval between the 2nd and the 3rd measurement is 479s much larger than the planned value 240s. How come? Many thanks for your attention. Best regards, wenqin