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I believe it's a senseless question. Frequency tolerance of the generated signal depends exclusively on the initial accuracy, temperature drift and aging of the utilized crystal or reference oscillator. Allowed frequency variation is commanded by the application and in part by regulations like ETSI or FCC.
Crystals with down to +/- 10 ppm stability over temperature range are available from several vendors. For better stability use external temperature compensated oscillator (TXCO).
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