Possible hiatuses present in XBL-4 (entity_id = 264), XBL-26 (entity_id = 266). There are two d18O values at the same depth_sample in XBL-4 (entity_id = 264, depth_sample = 132mm) and XBL-29 (entity_id = 268, depth_sample = 183mm) consistent with the original publication.