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We apply the ring-diagram technique to high resolution Dopplergrams in orderto estimate the variation in oscillation mode parameters between active andquiet regions. We demonstrate that the difference in mode parameters betweentwo quiet regions can be as large as those between a pair of active and quietregion. This leads us to conclude that the results derived on the basis of asingle quiet region could be biased.

Does the Selection of a Quiet Region Influence the Local Helioseismic Inferences?