## Graph Panel

The graph panel shows plots for the currently selected measurement. The plots are selected via the buttons at the top of the graph area.

The various graph types are:
SPL and Phase
All SPL
Distortion
Impulse
Filtered IR
Group Delay
RT60
Spectral Decay
Waterfall
Spectrogram
OscilloScope

Options that affect the appearance of the traces can be found in the View Preferences.

Each trace can be turned on or off via the selection buttons to the left of the trace name in the legend panel. Trace names are in the same colour as the trace itself, whilst the line style for the trace is shown between the label and the trace's value at the current cursor position. If a trace has smoothing applied the octave fraction is shown (1/12th octave in the example below).

#### Capture Graph Image Button

This button at the top left corner of the graph area allows the current graph view to be saved as an image. A dialog pops up to set the desired width of the image (click default to set the image to be the same width as the graph). If the "Include Title" box is checked the graph type will be shown at the top of the graph. If the graph has data that can have smoothing applied to it the amount of smoothing (if any) will be shown at the top of the graph, alongside the title (if selected). If the "Include Legend" box is checked the image includes the graph legend. Text typed into the box that shows "Type any additional text here" will appear on the graph image near the top of the graph, beneath the title and/or smoothing settings. The graph will be saved as either JPEG or PNG according to the type selected.

#### Scrollbars Button

The Scrollbars button toggles scrollbars for the graph area on/off, hiding the scrollbars provides more room for the graph. The setting is remembered for the next startup. If the scrollbars are off, the graph can still be moved by holding down the right mouse button while in the graph area.

#### Frequency Axis Button

The Freq Axis button toggles the frequency axis between logarithmic and linear modes. This function is also available via a command in the Graph menu and the associated shortcut keys.

#### Graph Limits Button

The Graph Limits button allows desired top, left, bottom and right graph limits to be defined. A dialog pops up in which the values are entered, they are applied as they are entered or by clicking the Apply Settings button.

#### Graph Controls Button

The Graph Controls button brings up a menu of control options for the currently selected graph type, if there are any.

#### Horizontal Axis Zoom Buttons

The horizontal axis zoom buttons appear when the mouse pointer is inside the graph area, they zoom in or out by a factor of approximately 2 centred around the cursor position. You can also zoom with the keyboard.

#### Vertical Axis Zoom Buttons

The vertical axis zoom buttons appear when the mouse pointer is inside the graph area, they zoom in and out on the Y axis. You can also zoom with the keyboard.

#### Variable Zoom

REW provides a variable graphical zoom capability by either pressing and holding the middle mouse button, or pressing the right button then, while the right button is held down, pressing and holding the left button and dragging the pointer.

When variable zoom is active a cross is displayed, split into quadrants allowing horizontal and/or vertical zooming in our out depending on the mouse position. The amount of zoom is governed by how far the mouse pointer is dragged from the start position.

#### Zoom to Area

When the Ctrl key is pressed followed by the right mouse button a zoom box can be drawn by dragging the mouse. Note that on a Mac it may be necessary to press both the Ctrl and fn keys, or to hold down Ctrl and drag two fingers on the trackpad. Measurement cursors are shown on the outside of the box, to zoom to the shaded area click within it. If the shaded area is too small to zoom in to a message will indicate which dimension is too small for zooming and what the limit is to allow zoom.

#### Zoom with Keyboard

To zoom in on the horizontal axis press Shift+x, to zoom out press x. To zoom in on the vertical axis press Shift+y, to zoom out press y. The zoom is centred on the cursor position. You may need to click on the graph first.

#### Undo Zoom

To undo the last Variable Zoom or Zoom to Area, press Ctrl+Z or select the Undo Zoom entry in the Graph menu. This will restore the graph axes to the settings they had when the right or middle mouse button was last pressed. This Undo feature can be used even if you have not zoomed, just press the right mouse button when the axis settings are to your preference then you can return to these settings (undoing any subsequent movements or control changes) by pressing Ctrl+Z.

#### Arrow Keys

The arrow keys can be used to move the graph cursor in single pixel increments. You may need to click on the graph first. To move the graph instead of the cursor, hold down the Shift key while pressing the arrow keys.

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