I did some simulation analysis on the available resistors: https://github.com/xorbit/sky130-power-blocks/blob/master/primitive-test/resistors.md
Some related questions are:
• Where can I find the models that are in the docs but don't seem to be in the repo?
• Is the lack of temperature modeling in some of the models due to incompatibility with ngspice?
• Are the P- poly resistors really that stable over temperature?
• Looking through the rules/device-details doc, there are a ton of symbols that seem to be made in xschem. I can't seem to find them in the PDK, are they available somewhere?