Scale Type

Two types of chart Scaling can be selected: Linear or Semi-Log.

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Semi-Log Scaling

A Semi-Log (percent-of-change) price scale is a percentage-based scale. A 10% change in price will always be represented by the same displacement along the vertical axis, regardless of the absolute price change. A $5 price change from a $50 base price (10%) will be represented by the exact same vertical displacement as a $10 price change from a $100 base price (10%), even though the absolute values of $5 and $10 are not equal.

Important: Margins should not be used with a Semi-Log price scale.

Setting Semi-Log Scaling Type

Scaling Type is set from the Format Symbol window:

1. Open the Format Symbol window.
   
   
   To open the Format Instruments window, click the Format Instruments icon on the main toolbar;
   if the Format Objects window appears, select the symbol and click the Format button.
   
   The Format Instruments window can also be opened by one of the following methods:
     - Position the mouse pointer over the symbol's data series; double-click once the Pointer changes into a Hand ;
     - Position the mouse pointer over the symbol's data series; once the Pointer changes into a Hand right-click and then click Format Symbol Name;
     - Right-click on an empty area of the chart and then click Format Instruments; if the Format Objects window appears, select the symbol and click the Format button;
     - Select Format in the main menu and click Instrument; if the Format Objects window appears, select the symbol and click the Format button.
   
   
2. Select the Scaling tab.
3. In the Scaling Type section, click the Semi-Log radio button.

To center the last quote in the middle of the price scale, check the Center Last Price check box; the last quote can not be centered for a chart with a User Defined price scale.

To use these scaling settings for all new charts, check Use as Default check box.