Computation of the O (p6) order low-energy constants: An update

We update our original low-energy constant computations to the O (p⁶) order, including two and three flavors, the normal and anomalous ones. Following a comparative analysis, the O (p⁴) order results are considered better. In the O (p⁶) order, most of our results are consistent with or better than those we have found in the literature, although several are worse.