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If you have current mirror racks in your PTAT / bandgap,
then adding yet another mirror with a different combination
of emitter area and emitter resistor can produce yet another
temperature coefficient (more resistor makes current
TC less positive / more negative).
A MOS mirror rack might not be quite as well behaved,
don't know how consistent the TC behavior of Id/Vg
might be, to beat against resistor TC, over process.