Listing of dropsonde locations in the FNL on 990123 at 00z     
                                                                
    c1: valid time as a difference in hours from 990123-00z     
    c2: call letters                                            
    c3: east longitude                                          
    c4: north latitude                                          
    c5: report type (132-temps, 232-winds, 182-splash)          
    c6: number of reported levels