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Squared length of 4-momentum g(p,p)?

Problem Statement
Can someone explain why the squared length of p^2 = p dot p = -m^2 and not -m^2*c^2?
Relevant Equations
p^2 = p dot p = -m^2
Explained in statement.
That depends on two things:
1. What is the metric you use

2. What are the units you are using.


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