procedure xcem ()

string      dummy

begin

   int      ntemp, i, j, itt, itemp, itmax, iap
   int      ii, jj, itnum[6]
   real     zz, rr, z[6], r[6], zmax, rmax
   real     c, cz
   string   s1, s11
   bool     done

   ntemp = 6
   c = 299792.458

   done = no

   while (done == no) {
    print("enter command: ")
    if (scan(s1) != EOF) {
     s11 = substr(s1, 1, 1)
     if (s11 == "x" || s11 == "e") {
       print(" ")
       list = "mmultimake_c.tmp"
       rmax = 0.
       itmax = 0
       zmax = 0.
       for (i=1; i<=ntemp; i+=1) {
         if (fscan(list, itt, itemp, iap, zz, rr) != EOF) {
            z[itemp] = zz
            r[itemp] = rr
            if (itemp != 6) {
               itnum[itemp] = itemp
            }
            else {
               itnum[itemp] = 5
            }
            print(itt, z[itemp], r[itemp])
            if (r[itemp] > rmax && itemp != 6) {
               rmax = r[itemp]
               itmax = itemp
               zmax = z[itemp]
            }
         }
       }
       print(" ")
       list = ""
       if (s11 == "x") {
          j = 1
          if (itmax > 0) 
             j = itmax
          cz = c * zmax

          if (stridx("a", s1) != 0) {
             print("enter aperture: ")
             if (scan(ii) != EOF) {
                iap = ii
             }
             else {
                print("defaulting to current aperture ", iap)
             }
          }

          if (stridx("t", s1) != 0) {
             print("enter template: ")
             if (scan(jj) != EOF) {
                j = jj
                if (j < 1 || j > ntemp) {
                   print("warning: template ", j, \
                         "out of bounds")
                   j = 5
                   print("defaulting to template ", j)
                }
             }
             else {
                j = 5
                print("defaulting to template ", j)
             }
             cz = c * z[j]
          }

          if (stridx("z", s1) != 0) {
             print("enter guess redshift z: ")
             if (scan(zz) != EOF) {
                cz = c * zz
             }
             else {
                cz = 0.
                print("defaulting to cz = ", cz)
             }
          }

          print("cz = ", int(cz), " km/s")
          
          s2 = "templates.0000" + itnum[j]

          if (stridx("n", s1) != 0) {
            print("xcsao cleancalm specnum=", iap, \
                  "template=", s2, " czguess=", int(cz), \
                  "save_vel=no")
            xcsao("cleancalm", specnum=iap, \
                  template=s2, czguess=int(cz), save_vel=no)
          }
          else {
            print("xcsao cleancalm specnum=", iap, \
                  "template=", s2, " czguess=", int(cz), \
                  "save_vel=yes")
            xcsao("cleancalm", specnum=iap, \
                  template=s2, czguess=int(cz), save_vel=yes)
          }
          print("done xcsao")
          print(" ")
#       (s11 == "x")
       }
       else if (s11 == "e") {

          if (stridx("a", s1) != 0) {
             print("enter aperture: ")
             if (scan(ii) != EOF) {
                iap = ii
             }
             else {
                print("defaulting to current aperture ", iap)
             }
          }

          print("emsao cleancalm specnum=", iap)
          emsao("cleancalm", specnum=iap)
          print("done emsao")
          print(" ")
       }
     }
     else if (s1 == "q") {
      done = yes
     }
     else {
      print("unknown command")
      print("try again")
      print(" ")
     }
#     (s1 begins with "x" or "e")
    }
    else {
     done = yes
    }
   }
#   (read from std. input)
   print("done xcem")
   print(" ")

end