Basis = {INT[1] -> (m2 - s13 - s23) * eps *PL[2, 0, 1, 0],
INT[2] -> s23 * eps * PL[0, 2, 0, 1],
INT[3] -> eps * PL[2, 0, 0 ,1],
INT[4] -> (m2 - s13 - s23) * s23 * eps^2  * PL[1, 1, 1, 1]}

Masters = {PL[2, 0, 1, 0], PL[0, 2, 0, 1],
 PL[2, 0, 0, 1], PL[1, 1, 1, 1]};