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diff_hkl2two_theta( $h, $k, $l[, $par])
diff_hkl2omega( $h, $k, $l[, $par])
diff_hkl2chi( $h, $k, $l[, $par])
diff_hkl2phi( $h, $k, $l[, $par])
diff_hkl2mu( $h, $k, $l[, $par])
diff_hkl2gamma( $h, $k, $l[, $par])
diff_hkl2delta( $h, $k, $l[, $par])
Returns the angle that corresponds to hkl. The meaning
of the optional parameter $par depends on the mode:
For the fixed-psi mode it is the psi value, for the
fixed-phi mode it is phi and for the fixed-om2 mode it is om2.
$tt = diff_hkl2two_theta( 1, 1, 1);