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good phrases as start

good phrases as start

I'm a student doing assignment in physics. I want to write a request from professor at another university to get some measurements from their labs . I don't know how can i start. what are the polite way to ask for this help? and how do i end the email?
i want to say that i know u r very busy ... but i think it's not good expression, is it?

please i appreciate any help i can get

Thanks
Jorjy