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+/- 10 percent is going to be difficult without trim. Depending on what devices you have in your process, you can create some sort of PTAT or CTAT to try to cancel the temperature effect. It may be easier to run your oscillator at a higher frequency and then divide down by 2X or 4X or 8X etc. THat gets you away from large caps and small currents which may help the oscillator spread.
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