Overlay figures for easy comparison


This tool is designed to help visually correlate multiple types of data by laying transparent figures atop one another. To use it, follow these steps:

  • From the main page(s), drag-and-drop figures onto the button with this icon:
  • Expand this dialog box and use the Overlay button (to the right) to render a new figure by overlaying the ones selected
  • Add more figures using the steps above, click Overlay to re-render, and use the Download button to save to a local file
  • Use the Clear button to clear all figure selections

Note: figures are remembered across tabs, so multiple times and subsystems can be compared at once.

The environment at the LIGO sites is monitored by the Physical and Environmental Monitoring (PEM) system. This system is comprised of a network of sensitive instruments that are designed to precisely measure environmental disturbances. The diagram below shows the layout of the PEM sensors at the LIGO Livingston Observatory (LLO). For more information on the PEM system, please see pem.ligo.org.

This page is a product of the Gravitational Wave Open Science Center.