<|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 data displayed on the virtual globes are all published and freely available, but at a number of different internet sites. links to all relevant sites can be found on the web pages for the individual virtual globes on the gplates portal at http://portal.gplates.org/. summary: gravity grid, http://topex.ucsd.edu/grav_outreach/, owner: scripps institution of oceanography, contact: david sandwell, dsandwell@ucsd.edu; magnetic grid, http://geomag.org/models/emag2.html, owner: national oceanic and atmospheric administration of the u.s. department of commerce, contact: stefan maus, stefan.maus@colorado.edu; srtl15 plus topography, http://topex.ucsd.edu/www_html/srtm30_plus.html, owner: scripps institution of oceanography, contact: david sandwell, dsandwell@ucsd.edu; seafloor lithology grid, http://www.earthbyte.org/seafloor-lithology-of-the-ocean-basins/, owner: the university of sydney, contact: adriana dutkiewicz, adriana.dutkiewicz@sydney.edu.au; plate reconstructions used to reconstruct the gravity and magnetic grids, http://www.earthbyte.org/global-continental-and-ocean-basin-reconstructions-since-200-ma/, owner: the university of sydney, contact: dietmar müller, dietmar.muller@sydney.edu.au; dynamic topography grids, http://www.earthbyte.org/a-review-of-observations-and-models-of-dynamic-topography-2013/, owner: the university of sydney, contact: nicolas flament, nicolas.flament@sydney.edu.au; magnetic anomaly identifications, http://www.soest.hawaii.edu/pt/gsfml/ml/index.html, owner: numerous authors of papers listed on web site above, contact: maria seton, maria.seton@sydney.edu.au.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>