public override System.String ToString()
{
System.String str = "\n --- SOT (" + lsot + " bytes) ---\n";
str += ("Tile index : " + isot + "\n");
str += ("Tile-part length : " + psot + " bytes\n");
str += ("Tile-part index : " + tpsot + "\n");
str += ("Num. of tile-parts : " + tnsot + "\n");
str += "\n";
return str;
}