<|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: by u.s. law, the data used in this study must be publicly available, since they were collected by the national marine fisheries service (nmfs), a public agency. survey effort and cetacean sightings can be accessed freely on obis seamap (http://seamap.env.duke.edu/). more detailed data associated with sightings and effort conditions are freely available without restriction upon request to the marine mammal and turtle division's director (lisa t. ballance; lisa.ballance@noaa.gov; https://swfsc.noaa.gov/mmtd/). the reason for this is that such data need to be processed to be in a useful form. satellite altimetry data are freely available upon registration in the aviso web site (http://www.aviso.altimetry.fr/en/home.html). the multivariate enso index used in this study can be accessed freely from noaas earth system research laboratory, physical sciences division (http://www.esrl.noaa.gov/psd/enso/mei/#data).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>