Why missing spice data on this window?

Greetings Kicadders: Was testing out the Sallen Key Demo file in eeschema to test out the spice sim, but I notice some components don’t have the spice primitive and mapping called out. Anyone know why that might be? The sim still works fine. Do all passives – R, C, & L need to have this? Confused.


for R,C and L, it will take from the value fields, please read the ngspice documentation for units.

and a recent updated tutorial:

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