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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ACHTxy -- Change datatype of vector from "x" to "y" (doubly generic).
+# The operation is performed in such a way that the output vector can be
+# the same as the input vector without overwriting data.
+
+procedure achtdd (a, b, npix)
+
+double a[ARB]
+double b[ARB]
+int npix
+
+begin
+ call amovd (a, b, npix)
+end