@User: There is a file in the PDK called "sky130.lib.spice". If you add a statement to the netlist (through a text block in xschem) with the syntax

.lib sky130.lib.spice tt

it will simulate at the

tt

corner. Other corners represented in the

sky130.lib.spice

file are

ss

,

ff

,

sf

,

fs

, for MOSFETs, and then

ll

,

hh

,

lh

, and

hl

for resistors and capacitors. The categories are set up to do resistor/capacitor corners at typical FET parameters, and to do FET corners at typical resistor/capacitor parameters. If you want to test both at the same time, e.g.,

sshh

or

ffll

, you can make a copy of

sky130.lib.spice

and define your own corners. The file is nothing but a bunch of

.include

statements, so you can pick and choose the ones you want for any corner simulation you want to define.