ACKNOWLEDGMENTS
The authors would like to acknowledge the support of
U.K. Natural Environment Research Council through re-
search grant number GR3/10186. The digital map data
used in this study are reproduced from the Ordnance
Survey 1:1250 scale Land-Line.93+ with the permission
of the Controller of Her Majesty’s Stationary Office,
Crown Copyright. We are grateful to Peter Blamire and
Thomas Bauer (Department of Geography, University of
Wales Swansea, UK) for their assistance in processing
these data.
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