Parameter 'ns_splits'
An integer vector of years used to split the data into homogeneous
subperiods. For S-FFA, set to NULL (default). For NS-FFA, specify an integer vector
of years with physical justification for change points, or NULL if no such years exist.
In R, integers have the suffix L, so 1950L is a valid input to ns_splits, but 1950
is not (since it may be interpreted as a floating point number).