Adding Two Time Functions Together

1. Go to the Add functions tab in the Time function definition dialog.
2. Select a function from the list of available functions, and then click → to add it to the Function 1 box.
3. Enter a coefficient value for the first time function in the Factor box.
4. Repeat steps 2 and 3 for the second function.
5. Enter a name for the function in the Name box.
6. Click Summation. The resulting function is added to the list of defined functions.
   Note: The value of the resultant function is interpolated at the points with common abscissae. Each of the defined functions can be multiplied by a user-defined coefficient.