<|begin_of_text|><|start_header_id|>system<|end_header_id|>

You are an expert at identifying data availability statements in scientific text. A data availability statement describes where research data can be found or how it can be accessed.<|eot_id|><|start_header_id|>user<|end_header_id|>

Determine if the following text contains a data availability statement. Answer with 'yes' or 'no'.

Text: all data are fully available without restriction. (1) pm2.5 concentration data was available on the website of beijing environmental monitoring center. data are available from http://www.bjmemc.com.cn. (2) land use data were obtained from the center for earth system science, tsinghua university. data are available from http://data.ess.tsinghua.edu.cn/. (3) population dataset was from institute of geographic sciences and natural resource research, cas. data are available from http://www.resdc.cn/data.aspx?dataid=117. (4) dem data was derived from aster gdem 1st edition (v1). data are available from http://gdem.ersdac.jspacesystems.or.jp/. (5) other relevant data were within the paper.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>