Input Instructions for MIXR

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     *                                                                *
     *  card 1  --  units                                             *
     *     nout      output unit for mixed cross sections             *
     *     nin1      first input unit (endf or pendf)                 *
     *     nin2      second input unit                                *
     *      ...       continue for nnin<=10 input units               *
     *                                                                *
     *  card 2  --  reaction list                                     *
     *      mtn       list of nmt<=20 mt numbers for                  *
     *                   the output reactions                         *
     *                                                                *
     *  card 3  --  material list                                     *
     *     matn,     list of nmat<=10 pairs (matn,wtn) of mat         *
     *      wtn       numbers and associated weight factors           *
     *                                                                *
     *  card 4  --  temperature                                       *
     *     temp      temperature (use zero except for pendf tapes)    *
     *                                                                *
     *  card 5  --  output material                                   *
     *     matd      material number                                  *
     *     za        za value                                         *
     *     awr       awr value                                        *
     *                                                                *
     *  card 6  --  file 1 comment card                               *
     *     des      description (60 char max)                         *
     *                                                                *
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