About the relation of reflection and ripple coefficient

Hi,
I have a question about the relation between reflection coefficient and ripple coefficient in filter design in rf circuit.
I have read two kind of relationship of them as shown by the following pictures.
Can anyone tell me which one is right?

And I want to where is the relationship from, and how to calculate it, for an example, when we want to get a -10dB reflection coefficient, we should make the ripple coefficient below -0.46dB, can anyone show me the process of this calculation and what unit should we take in calculation, dB or others, please?

Thank you!
Best regards!