PNG plot generates screen output and opens an interactive session. Using buttons/slider you can
In case of Time Table / Catalog input you navigate over Time Table intervals.
Extend/Shift (4). Time extention/shift value can be positive (interval extention, positive time shift) or negative (interval shrinking, negative time shift).
You find the description of (6) Linked to Multi Plot Mode in the MultiPlot Mode section and (7) access to Hubble Space Telescope images in the Access to Hubble Images section.
Zoom In Time Interval (3)
After right clicking Zoom On Time Axis in the context menu
select interval of interest by clicking image.
You can either