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Fig. 1


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MagIE (ARM, BIR, VAL) magnetometer observatories (blue) and the 43 MT site locations (red) used in this study. Example MT sites (A–E) used subsequently, are marked with red text. Site A was an example site used when optimising a correction for the nowcast geoelectric field. Sites B–E were all used to validate the nowcast model.

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