<prompt> Translate the following text to EnglishKwa mfano, Zimmer na Gavin kituo cha FGD retrofits uliofanywa katika mapema 1990s wote ni pamoja na absorbers tatu juu ya kila 1300 MWe kitengo.  <response>: For example, the Zimmer and Gavin station FGD retrofits performed in the early 1990s both involve three absorbers on each 1300 MWe unit. 