Get the space occupied by a Table in Teradata

How can you find the Table Space Size of your table across all AMPs ?
 
SELECT DATABASENAME, TABLENAME, SUM(CURRENTPERM)/(1024*1024*1024) as TableSize_GB
FROM DBC.TABLESIZE
WHERE DATABASENAME = ‘<DATABASE_NAME>’
AND TABLENAME = ‘<TABLE_NAME>’
GROUP BY DATABASENAME , TABLENAME;