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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: Previous attempts at measuring the correlation by cross correlating the CMB with both the HEAO-1 and the NVSS maps have yielded only upper limits [ 6,7 ] . Here we repeat these analyses with the WMAP satellite data . We use two CMB maps generated from the WMAP data : the " internal linear combination " ( ILC ) map [ 11 ] ; and the " cleaned " map of Tegmark , de Oliveira - Costa and Hamilton [ 12 ] . The dominant " noise " to the cross correlation signal is due to the fluctuations in the CMB itself and is well characterized , while the instrument noise is negligible on the angular scales relevant to the present analysis . To reduce possible residual Galaxy and nearby radio source contamination , these maps were masked with the most aggressive mask provided by the WMAP team [ 11 ] . The X - ray map was similarly masked and , in addition , was corrected for several large scale systematics including a linear drift of the detectors [ 7 ] . Finally , the NVSS catalog was corrected for a systematic variation of source counts with declination [ 6 ] . The sky coverage was 68 % for the CMB maps , 56 % for the NVSS map , and 33 % for the X - ray map . The aggressive masking of the X - ray maps was chosen because of the low resolution of the map ( 3 • ) and the larger number of foreground sources . Significantly , however , our results are relatively insensitive to the corrections and level of masking of the maps .<|eot_id|><|start_header_id|>assistant<|end_header_id|>

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