{
"header":
{
  "format":"fixed_width",
  "encoding":"ascii"
},
  "elements":
      {
        "RH":    {"description":"Relative humidity",  "field_length":3,"column_type":"object"},
        "S H P": {"description":"Ship number",        "field_length":1,"column_type":"str","codetable":"ship"}
  }
}