<|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 long term grazing and vegetation biomass data used in this paper is owned by the amboseli conservation program-african conservation centre and can be requested directly via www.amboseliconservation.org or by writing to the database administrator, amboseli conservation program (amboselicp@gmail.com). other datasets such as satellite (ndvi) used were obtained from public sources as stated and referenced in the manuscript.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>