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Figure 1. (a) Reference phase image and (b) subtracted phase image of cylindrical uniform test object, with region of interest (ROI) used for measurements indicated. The variation of the average ROI phase value over a series of subtracted phase images is shown in (c), both in the absence of any magnetic field disturbance, and in the presence of a magnetic field disturbance caused by bringing a strongly paramagnetic solution to the test object vicinity and then removing it.
