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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: It is not clear what controlling factor is responsible for the higher - than - average mass data points at specific altitudes in 2007 ( orange ) and 2008 ( green ) in figures 3(a ) and ( b ) . Figure 3(e ) shows that sampling in 2007 was mostly in the northern hemisphere , suggesting again a possible seasonal ( winter ) effect . Solar activity was not very variable due to the long solar minimum of solar cycle 23/24 during the years sampled . The solar radio F10.7 cm flux at 1AU remained low until 2010 when it started to increase slightly ( see e.g. figure 1 in Westlake et al . 2014 ) . The absence of any higher masses in 2012 ( which was well into the rising phase of solar cycle 24 ) suggests that high masses have some preference for low solar activity , however other controlling factors could also be responsible . Westlake et al . ( 2014 ) report that higher methane concentrations were observed during solar minimum compared to solar maximum . This is believed to be due to higher photochemical reaction rates during solar maximum , which in turn create more C 2 hydrocarbon building blocks leading to the production of more of the more complex hydrocarbon chains . However , fewer photodestruction reactions due to solar minimum may provide better conditions for the negative ions to grow to higher masses at a specific altitude . Shebanits et al . ( 2017 ) investigated the effects of changing EUV fluxes on positive and negative ion charge carriers using RPWS - LP and found that dayside charge densities increased by a factor of 2 from solar minimum to maximum , whereas nightside densities decreased .<|eot_id|><|start_header_id|>assistant<|end_header_id|>

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