From the case:
Herringbone artifact
{"current_user":null,"step_through_annotations":true,"access":{"can_edit":false,"can_download":true,"can_toggle_annotations":true,"can_feature":false,"can_examine_pipeline_reports":false,"can_pin":false},"extraPropsURL":"/studies/16460/annotated_viewer_json?lang=us"}
Case Discussion
Aka criss-cross or spike artifact. May have various causes, e.g. electrical discharge, external interference etc.)
Unable to process the form. Check for errors and try again.