case 0: string="ave"; break;
    case 1: string="acc"; break;
    case 2: string="max"; break;
    case 3: string="min"; break;
    case 4: string="last-first"; break;
    case 5: string="RMS"; break;
    case 6: string="StdDev"; break;
    case 7: string="covar"; break;
    case 8: string="first-last"; break;
    case 9: string="ratio"; break;
    case 10: string="standardized anomaly"; break;
    case 11: string="summation"; break;
#ifdef WMO_VALIDATION
    case 12: string="confidence index"; break;
    case 13: string="quality indicator"; break;
#endif
/*    case 51: string="climo"; break; */
    case 255: string="missing"; break;