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In an attempt to make the debate around the costs of open access publishing more evidence-based, the Wellcome Trust is releasing into the public domain details of its open access spend in the year 2012-2013, as reported by UK institutions and the Trust’s Major Overseas Programmes in receipt of an OA block grant. The data only include information when an APC was levied. If an author has self-archived a paper, or the publisher provides a gold OA service (but makes no charge), this information is not included in this dataset. Equally, data are not included in cases where a researcher (based at an institution not in receipt of an OA block grant) received a supplement to their grant to cover OA publishing costs
Robert Kiley (Wed,) studied this question.