BJR -- Warren-Forward and Duggan 77 (917): 426 Figure 2

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Figure 2. Demonstration of digital subtraction of GR-200A and GR-200F. The GR-200A chip is clearly visible on both (a) the pre-and (b) the post-subtraction images. This is in contrast with the GR-200F chip which is not visible on (c) the pre-subtraction image and only just visible on (d) the post-subtraction image.