While extracting the spice netlist from Magic sometimes an extra capacitance or two is written out. What is the reason and how to prevent it @Tim Edwards? This extra cap caused LVS to fail. C0 vss vcc 3.123987f ** Floating -> like this

That is a parasitic cap and the way to avoid it is always to use

ext2spice lvs

before running

ext2spice

.

but what if we want parasitics? figured this out from other threads

In that case I'd have to look at the specific situation. There are various ways to get floating caps. In the worst case, you can just do a simple edit on the netlist by deleting all lines containing "Floating".