@User thanks for the note.. Now that i know i have to use lower case, it is not an issue. nice to include upper case as well when possible. I have successfully designed and simulated an LDO circuit in xschem+ngspice using skywater pdk. I am now exploring how to do montecarlo sims in ngspice using skywater pdk... I use cadence at work to do circuit design and these open source tools are quite impressive. there is somewhat steeper learning curve but once we get a hang of it, we get quite capable with opensource tools. And what is so great about openEDA tools is that there is good support. But sometimes the information is not all in one place and it seems distributed but it is out there... I will try to capture my learnings in a couple of videos as well to benefit others. Thanks again.