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i have browsed this forum for topics about this, and i found them very enlightening and helped a lot in terms of finding the length of the primitive vectors , the problem that i have is with the direction of said primitive vectors , while in fcc they are more or less easy to visualize in BCC they are not .

so my question is , how is the direction in BCC of the primitive vectors found ? i mean what are the steps and conditions followed to get those directions ?

thank you in advance.