@User Thanks a lot for the much-needed help. I will follow the instructions and try to rerun xschem. Thanks alot. There is one more query. Like in madvlsi directory, there are tt_models, fs_models, sf_models and ff_models, from where can we add these corner models if we are working with libraries like ~/share/xschem/xschem_library/devices or sky130 library? Further more I could not get the proper documentation on madvlsi, demonstrating how to use this directory?