HTTP error 404:   Object not found!
 

http://www.cs.uleth.ca/~yazdani/MSRI_archive/level_lowering_data_split.txt is missing or not available from your IP address of 3.83.87.94

If the address has a tilde component, such as /~username  , then the web page is a user webpage and you should contact username@cs.uleth.ca .
Otherwise, contact webmaster@cs.uleth.ca for help although a response is variable.