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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: Our NIR study combined with optical data was able to address the issue of the optical - NIR colour and colour gradient of BL Lac host galaxies using a large and homogeneous dataset . The results confirm and extend previous findings ( also reported for RGs and quasars ) that the R - H colour and colour gradient distributions of the BL Lac hosts are much wider than those for normal ellipticals with old stellar populations , and many BL Lacs have bluer hosts and/or steeper colour gradients than those observed in normal ellipticals . Assuming that the blue colours are caused by a young stellar population component , it may represent the link between the SF episode caused by an interaction / merging event and the onset of the nuclear activity . However , both the optical and NIR images of BL Lac hosts show few obvious signs of interaction ( e.g. tidal tails , asymmetries , secondary nuclei ) . This may require a significant time delay ( at least 100 Myr ) between the event with associated SF episodes and the start of the nuclear activity .<|eot_id|><|start_header_id|>assistant<|end_header_id|>

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