<|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: the soil data is within the paper and its supporting information files. all environmental data used in this study come from third parties. they are freely available from their data accesses, togography data (http://srtm.csi.cgiar.org/), climate data (http://cdc.nmic.cn/home.do) and landsat tm (http://westdc.westgis.ac.cn).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>