Utilize the input text as a context reference, choose the right relationship between Gazprom Neft and retail from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Separately, I'd like to note a few words about the retail network, an important event here that the Gazprom Neft went out to introduce modern technologies for energy efficiencies, modernizing the equipment at more than 600 of its retail location, which enabled us to raise the level of energy efficiency by 50%.

Answer: industry