Canon EOS 7 - Manual (Page 94)

Reference
Program Line
The program line below applies when the camera is used in the
Program AE mode with an EF 28-90mm f/4-5.6 lens.
— : At 28m m focal length : At 90m m focal length
Program Line Description
The bottom horizontal axis represents the shutter speed and the right
vertical axis represents the aperture. On the left edge and top edge of the
graph, the Exposure Value (EV) is indicated for the respective shutter
speed and aperture combination set by the Program AE mode and denoted
by the program line.
Example: When the 28mm focal length is used and the subject brightness
is EV 13, the point where the diagonal line from EV 13 (on the top edge of
the graph) intersects the program line indicates the corresponding shutter
speed (1/125 sec.) and aperture (f/8) which the program sets automatically.
The arrowhead lines above the graph indicate the metering range for the
respective film speed.
94