case 200: string="entire atmosphere (considered as a single layer)"; break;
 case 201: string="entire ocean (considered as a single layer)"; break;
 case 204: string="highest tropospheric freezing level"; break;
 case 206: string="grid scale cloud bottom level"; break;
 case 207: string="grid scale cloud top level"; break;
 case 209: string="boundary layer cloud bottom level"; break;
 case 210: string="boundary layer cloud top level"; break;
 case 211: string="boundary layer cloud layer"; break;
 case 212: string="low cloud bottom level"; break;
 case 213: string="low cloud top level"; break;
 case 214: string="low cloud layer"; break;
 case 215: string="cloud ceiling"; break;
 case 220: string="planetary boundary layer"; break;
 case 221: string="layer between two hybrid levels"; break;
 case 222: string="middle cloud bottom level"; break;
 case 223: string="middle cloud top level"; break;
 case 224: string="middle cloud layer"; break;
 case 232: string="high cloud bottom level"; break;
 case 233: string="high cloud top level"; break;
 case 234: string="high cloud layer"; break;
 case 235: string="ocean isotherm level (1/10 deg c)"; break;
 case 236: string="layer between two depths below ocean surface"; break;
 case 237: string="bottom of ocean mixed layer (m)"; break;
 case 238: string="bottom of ocean isothermal layer (m)"; break;
 case 239: string="layer ocean surface and 26c ocean isothermal level"; break;
 case 240: string="ocean mixed layer"; break;
 case 241: string="ordered sequence of data"; break;
 case 242: string="convective cloud bottom level"; break;
 case 243: string="convective cloud top level"; break;
 case 244: string="convective cloud layer"; break;
 case 245: string="lowest level of the wet bulb zero"; break;
 case 246: string="maximum equivalent potential temperature level"; break;
 case 247: string="equilibrium level"; break;
 case 248: string="shallow convective cloud bottom level"; break;
 case 249: string="shallow convective cloud top level"; break;
 case 251: string="deep convective cloud bottom level"; break;
 case 252: string="deep convective cloud top level"; break;
 case 253: string="lowest bottom level of supercooled liquid water layer"; break;
 case 254: string="highest top level of supercooled liquid water layer"; break;
 case 255: string="missing"; break;