Hello, while trying to import an unbalanced panel database from excel where I have different time periods the following problem appears: if the missing data are in the first/middle of colums/rows gretl imports correctly the matrix and the missing data, but if the missing column is the last one then the following error message appears (see terminal output). Also because the real dataset has around 400 variables and now I define them manually using series v1 = M[,1] series v2 = M[,2] series v3 = M[,3] I there any possibility of importing the variables names directly from excel? Thanks Mihai