def _get_colinear():
        c0 = np.array([
            0.19294738,  0.6202667 ,  0.45962655,  0.07608613,  0.135818  ,
            0.83580842,  0.07218851,  0.48318321,  0.84472463,  0.18348462,
            0.81585306,  0.96923926,  0.12835919,  0.35075355,  0.15807861,
            0.837437  ,  0.10824303,  0.1723387 ,  0.43926494,  0.83705486])

        c1 = np.array([
            -1.17705601, -0.513883  , -0.26614584,  0.88067144,  1.00474954,
            -1.1616545 ,  0.0266109 ,  0.38227157,  1.80489433,  0.21472396,
            -1.41920399, -2.08158544, -0.10559009,  1.68999268,  0.34847107,
            -0.4685737 ,  1.23980423, -0.14638744, -0.35907697,  0.22442616])

        c2 = c0 + 2*c1
        c3 = -3*c0 + 4*c1
        a = np.array([c3, c0, c1, c2]).T
        return a