Please see get_stics_versions_compat() for the full list of
STICS versions that can be used for the argument stics_version.
param_df is a data.frame with the following format:
| Sta_name | zr | NH3ref | latitude | patm | aclim |
| climatex_sta.xml | 2.5 | 0 | 49 | 1000 | 20 |
| climatex2_sta.xml | 2.8 | 0 | 49 | 1000 | 20 |
| climatex3_sta.xml | 2.2 | 0 | 49 | 1000 | 20 |
The first column gives the sta file name (to be generated),
all following columns give the parameter value to put in the file,
and each line denotes a separate sta file (for e.g. several USMs).
The first column name must contain the keyword sta or Sta or STA
as a prefix to be detected (as shown in the table extract above).
If not given (the default, NULL), the function returns the template as is.