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I work here viagra prix pharmacie suisse "There are a lot of ground stations that operate in radio frequencies, and Esa and Nasa have a long-lasting cross-support agreement. But in optical comms, there are very few ground stations. And if you don't try to agree on some standards, you will not be able to support the other agency's activities, and you would not be able to download the amounts of data that you would be able to download otherwise," he told BBC News.