code: def get_string(self, sigfigs=8):
          
          ctrl_dict = self.as_dict()
          lines = [] if "HEADER" not in ctrl_dict else \
              ["HEADER".ljust(10) + self.header]
          if "VERS" in ctrl_dict:
              lines.append("VERS".ljust(10) + self.version)
  
          lines.append("STRUC".ljust(10) +
                       "ALAT="+str(round(ctrl_dict["ALAT"], sigfigs)))
          for l, latt in enumerate(ctrl_dict["PLAT"]):
              if l == 0:
                  line = "PLAT=".rjust(15)
              else:
                  line = " ".ljust(15)
              line += " ".join([str(round(v, sigfigs)) for v in latt])
              lines.append(line)
  
          for cat in ["CLASS", "SITE"]:
              for a, atoms in enumerate(ctrl_dict[cat]):
                  if a == 0:
                      line = [cat.ljust(9)]
                  else:
                      line = [" ".ljust(9)]
                  for token, val in sorted(atoms.items()):
                      if token == "POS":
                          line.append("POS=" +
                                      " ".join([str(round(p, sigfigs))
                                                for p in val]))
                      else:
                          line.append(token + "=" + str(val))
                  line = " ".join(line)
                  lines.append(line)
  
          return "\n".join(lines)+"\n"
docs: Generates the string representation of the CTRL file. This is
          the mininmal CTRL file necessary to execute lmhart.run.