function transform_k = kors(leads12) %data in columns 12 leads
    korsMatrix = [0.38, -0.07, 0, 0, 0, 0, -0.13, 0.05, -0.01, 0.14, 0.06, 0.54;
            -0.07, 0.93, 0, 0, 0, 0, 0.06, -0.02, -0.05, 0.06, -0.17, 0.13;
            0.11, -0.23, 0, 0, 0, 0, -0.43, -0.06, -0.14, -0.20, -0.11, 0.31];
    transform_k = leads12 * korsMatrix';