The authors are grateful to Dr. Noelia Ramón for translating the paper into English. Dr. Laura López contributed to this paper by offering interesting suggestions. We thank all the people who have cooperated in the hailpad network in León, Spain. We also thank all the volunteers who contribute to the Italian hailpad network maintenance. We are in debt to Elena Gianesini for her work on hailpad data reduction and to the three anonymous reviewers for their helpful suggestions. This study was supported by the Junta de Castilla y Leon (Grants LE014A07 and LE039A10-2) and by the Spanish Ministerio de Ciencia e Innovación (Grants TEC2007-63216 and TEC2010-19241-C02-01).
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