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Image scores and loadings for PC 1 (a), PC 2 (b) and PC 3 (c) for an unhybridized micro-spot (negative ion images). PC 3 loadings (c) from the negative ToF-SIMS image data matrix indicate that the “halo” feature detected in spots by ToF-SIMS imaging is characterized by Si-containing fragments from the polymer-coated glass substrate. Images are 200 µm × 200 µm.
