returns a list of class 'sepan' containing :
calla call order
tab.namesa vector of characters with the names of tables
bloa numeric vector with the numbers of columns for each table
ranka numeric vector with the rank of the studied matrix for each table
Eiga numeric vector with all the eigenvalues
Lia data frame with the row coordinates
L1a data frame with the row normed scores
Coa data frame with the column coordinates
C1a data frame with the column normed coordinates
TLa data frame with the factors for Li L1
TCa data frame with the factors for Co C1