<|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: Next , the IRAF procedure apall was used to extract spectra from the calibrated .flt science files . We tested apertures between 9.0 and 17.0 pixels in intervals of 2 pixels and found that an 11.0 pixel aperture resulted in the lowest lightcurve residual scatter after fitting the white light data . However , the difference between apertures was minute ( ∼1 ppm ) . We then used cross - correlation to correct for subpixel shifts along the dispersion axis . The x1d files from CALSTIS were then used to calibrate the wavelength axis . Finally , both " white light " and six spectral channel lightcurves were produced by integrating the appropriate flux from each bandpass .<|eot_id|><|start_header_id|>assistant<|end_header_id|>

no<|eot_id|>