A powder-diagram automatic-indexing routine

The program presented here performs an automatic indexing of powder patterns by means of a trial-and-error method. It has been optimized and presents a good flexibility. It can account for various additional information, known a priori. In addition, extensive error computations are included in it, leading to a good reliability, even with some incidental errors. Moreover its input and printout have been implemented so that the program can be easily used even by non-specialists.