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angles()
$ret = diff_angles( chi => 90, phi => 0, omega => 0, two_theta => 0);
$ret = diff_angles( mu => 0, omega => 12, chi => 45, phi => 90, gamma => 0, delta => 24);
$ret = diff_angles();
If diff_angles() is called without an argument, it returns "2-theta omega chi phi" or "mu omega chi phi gamma delta" depending on the diffractometer type.