REMLF90 - Additions to PDF documentation
IM 02/17/2003

Two new random types were added. Type:
user_file
accepts a matrix from a file specified under keyword FILE in the following
format:
row col value
row col value
.....

Values can be lower- or upper-stored but not both. 

Second type:
user_file_inv
works as befoer except that the given matrix is inverted before being
used in mixed model equations.