Fig. 3From: Hf-W dating of zircon in mesosiderite with high-pressure sintered standardScanning electron microscope images of synthetic zircon (Std-A and Std-B) with the 330 times magnification. Bars show 10 µm. a SEI image of Std-A, b COMP image of Std-A, c SEI image of Std-B, d COMP image of Std-B. Red dotted and blue solid squares indicate the areas observed by SEM–EDS (Additional file 1: Fig. S3) and EPMA (Fig. 4), respectivelyBack to article page