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. 2018 Mar 5;8:3977. doi: 10.1038/s41598-018-21943-4

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Cultivated surface (ha) of maize in municipalities of Spain. Sampling locations in the Ebro Valley are indicated by dots: Los Monegros (1), Bajo Cinca (2), Tafalla (3) and Valdejalón (4). The map has been generated by own compilation with data corresponding to the Agrarian Census 2009 (http://www.ine.es/dyngs/INEbase/en/operacion.htm?c=Estadistica_C&cid=1254736176851&menu=resultados&secc=1254736194950&idp=1254735727106), taken from the Instituto Nacional de Estadística (INE) website: www.ine.es. To generate the map the following free specific software was needed: PC-Axis 2008, PX-Map 2001, and Municipal Maps (outlines of municipalities valid at 1 January 2009). All this software is available on the INE website (http://www.ine.es/ss/Satellite?c=Page&p=1254735116596&pagename=ProductosYServicios%2FPYSLayout&cid=1254735116596&L=1).