<|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 authors confirm that, for approved reasons, some access restrictions apply to the data underlying the findings. data used in this paper are only available upon request as they are owned by the national environmental monitoring center (cnemc). cnemc has the authority to publish the data. researchers can send their request and intention of using data to dr. guanhua xing (program director of atmosphere laboratory of cnemc, email address: xinggh@cnemc.cn).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>