PNG plot generates screen output and opens an interactive session. Using buttons/slider you can 1) navigate back and forth in time, 2) resize image, 3) select time interval for its zooming or storing in time table, 4) extend/shift time interval, 5) access to Hubble Space Telescope images.
In case of Time Table input you navigate over Time Table intervals.
Zoom In Time Interval
After clicking Zoom In Time Interval button select interval of interest by clicking image. You can either 1) zoom image or 2) insert selected interval into new or existing time table. Time Table name is to be typed (or dragged/dropped) in the Add In Time Table field.
Extend/Shift. Time extention/shift value can be positive (interval extention, positive time shift) or negative (interval shrinking, negative time shift).
You find the description of 5) access to Hubble Space Telescope images in the Access to Hubble Images section.