<|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: Simulated background event samples are used to derive the main background estimates in the case of analyses in the lν, ll, lνll, and llll channels and to extrapolate backgrounds from control regions in the analysis of the other channels. In other cases, the **data** are used to extract the normalization and/or shape of the background distributions. Although the production of background MC samples differed somewhat depending on the specific analysis, most MC samples were produced as follows. Diboson (WW, WZ, ZZ) events were generated with SHERPA [37] or POWHEG-BOX; W þ jets and Z þ jets events were generated with SHERPA for up to two partons at NLO and up to four partons at LO using the OPENLOOPS [38] and COMIX [39] programs, respectively. The production of top-quark pairs and single top quarks was performed at NLO with POWHEG-BOX. For the lν and ll channels, the dominant DY background was modeled using POWHEG-BOX with next-to-next-to-leading-order QCD and NLO electroweak corrections. More specific details can be found in the papers for each analysis.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

no<|eot_id|>