A list containing two objects, short and long. "long" shows the long-term predictions
and "short" the short-term predictions. If any of them did not get plotted due to lack of prediction or due to the term
argument, its value will return NULL.
By default only the long-term plot is generated, which means that the short term plot returns NULL.
This is changed with the term argument.
longThe plotted long-term prediction. The predictions are made on daily new confirmed cases or daily new deaths.
shortThe plotted short-term prediction. The predictions are made on daily cumulative cases or daily cumulative deaths.