The input to all basic routines is a MIDAS table containing at least
two columns with the mandatory labels `:TIME` and `:VALUE`.
For analysis in the time domain a third column, `:VAR`, containing the
variances of the column `:VALUE` is required. Since `DOUBLE
PRECISION` computations are used throughout the package, all input
columns must be also in `DOUBLE PRECISION`. In any case, it is
prudent to chop off (by subtraction of a suitable constant) from the
input `:TIME` column all leading digits which are insignificant
for the present TSA purposes. Also for numerical reasons, it is
recommended to use the command `NORMALIZE/TSA` to subtract the mean
from `:VALUE` prior to the analysis.