The Harmonized Index of Consumer Prices category "Gas (04.5.2)" is a classification of nondurable goods and energy that includes town gas and natural gas, liquefied hydrocarbons (butane, propane, etc.), associated expenditure such as hire of meters, reading of meters, storage containers, standing charges, etc.
This category is a subcategory of the Housing, Water, Electricity, Gas, and Other Fuels (04) and of Electricity, Gas, and Other Fuels (04.5) categories.
Information provided in the notes pertaining to HICP classifications can be found from the source at: http://ec.europa.eu/eurostat/ramon/nomenclatures/index.cfm?TargetUrl=ACT_OTH_CLS_DLD&StrNom=HICP_2000&StrFormat=HTML&StrLanguageCode=EN&IntKey=22470387.
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Eurostat, Harmonized Index of Consumer Prices: Gas for Latvia© [CP0452LVM086NEST], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/CP0452LVM086NEST, May 28, 2016.