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How should values be selected for the constants for the snubber circuit connected to the triac?

A snubber circuit is inserted for suppressing a suddenly rising voltage (dV/dt) to prevent malfunction. Toshiba recommends RS=47Ω and CS=0.033μF for a 100VAC system, and RS=100Ω and CS=0.1μF for a 200VAC system.
Refer to Toshiba Application Note "Triac couplers-basic properties and application design", section 9.6.
(https://toshiba.semicon-storage.com/ap-en/design-support/document/application-note.html)

snubber circuit

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