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What is the difference between Fast_Type_7_12 and Fast_Type_9_16?

My understanding is that Fast_Type_9_16 means that a circle of 16 points is selected around the current pixel and at least 9 continuous points in this need to be lighter or darker than current pixel for current pixel to be detected as a corner. is this correct? If this is correct, is there any way of changing 9 to some other value e.g. 10 or 12?