I edited the Openlane script [

sta.tcl

](https://github.com/efabless/openlane/blob/master/scripts/sta.tcl). At the end of this script I added:

write_sdf $::env(opensta_report_file_tag).sdf

I haven't checked the details, but it appears to populate the min/max part of triples, but typ is left unpopulated. I looked at the source code for

write_sdf

and it appears there is no code to populate the typ part of the triple.