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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 utility of a schlieren image lies in the fact that the refractive index is dependent on the density of the medium it passes through. Knowledge of this relationship permits one to obtain quantitative **data** from such images. To make this lucid, let ρ (x, y) be the spatially varying density of a fluid surrounding an object of interest; it is expressed as a scalar-field with a horizontal coordinate x and a vertical coordinate y. It has a linear relationship with the refractive index n (x, y),<|eot_id|><|start_header_id|>assistant<|end_header_id|>

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