@User taking the

sky130_tests/test_res.sch

, setting mult=1 on first simulation (top picture) and mult=4 on second simulation (second picture) on R9 (res_xhigh_po) affects resistance. The second resistance (500 Ohm) is 1/4 the first resistance (2kOhm). Resistance is measured as v(res)/I(res) vs temp. The resistor '`mult`' parameter is assigned in netlist both to ngspice

m

parameter and

mult

parameter. Ensure your open_pdks installations is reasonably recent.