Alternatively the angle may be set or adjusted in the position editor itself by interactively rotating the science field . The NIRI Iterator is a member of a class of instrument iterators . Each works exactly the same way, except that different options are presented depending upon the instrument. The table columns are items over which to iterate. In this example we are iterating over filters and exposure time so there are two corresponding columns in the table.
Table rows correspond to iterator steps.
At run time, all the values in a row are set at once. Selecting one of these items moves it into the table in its own column. Each cell of the table is selectable. The selected cell is highlighted green. When a cell is selected, the available options for its value are displayed in the box in the upper left-hand corner.