{"text_format":"3","workbook":"xls","n_sheets":3,"sheets":["Hoja1","Hoja2","Hoja3"],"read":"whole","date_system":"1900","formulas":"cached_only"}

{"sheet":"Hoja1","index":0,"n_rows":13,"n_cols":3,"rows_kept":13,"flags":["formulas_cached_only"]}
["EMPL_ID","YM","CUST_ID"]
[3011,"2011-03-01",92]
[3011,"2011-03-01",94]
[3011,"2011-03-01",93]
[3011,"2011-04-01",89]
[3011,"2011-04-01",90]
[3011,"2011-04-01",91]
[3011,"2011-04-01",93]
[3011,"2011-05-01",95]
[3011,"2011-05-01",96]
[3011,"2011-05-01",92]
[3011,"2011-05-01",89]
[3011,"2011-05-01",93]

{"sheet":"Hoja2","index":1,"n_rows":0,"n_cols":0,"rows_kept":0,"flags":["formulas_cached_only"]}

{"sheet":"Hoja3","index":2,"n_rows":0,"n_cols":0,"rows_kept":0,"flags":["formulas_cached_only"]}