Thank you Emily for your reply . do we have a record of the triple-dipped laninas before 1970 back to 1850 ? i would appreciate it if you kindly share a link to their archieve , I am trying to get better understanding of them via subjecting them to geometrical time-until-next event analysis if i had a long window of data like 1850-2022 to see if any story unveils from them . I will be happy to share the results with you if you may would like them in the near future

Thanks a cloud of thank You's 

Warm regards

Mohammad