def get_backbone_distribution(angles):
    phi = math.degrees(angles[0])
    psi = math.degrees(angles[1])
    if (((- 160) < phi < 0) & ((- 70) < psi < 60)):
        return 1
    elif ((0 < phi < 160) & ((- 60) < psi < 95)):
        return 2
    else:
        return 3
def get_backbone_distribution(angles):
    phi = math.degrees(angles[0])
    psi = math.degrees(angles[1])
    if (((- 160) < phi < 0) & ((- 70) < psi < 60)):
        return 1
    elif ((0 < phi < 160) & ((- 60) < psi < 95)):
        return 2
    else:
        return 3