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Two types of chart '''Scaling''' can be selected: '''Linear''' or '''Semi-Log'''.
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== Linear Scaling ==
A Linear price scale is the conventional, absolute scale. A $10 change in price will always be represented by the same displacement along the vertical axis, regardless of the base price from which the change took place.
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=== Setting Linear Scaling Type ===
Scaling Type is set from the '''Format Instruments''' window:
# Open the '''Format Instruments''' window.<br><span>{{FormatSymbol}}</span>
# Select the '''Scaling''' tab.
# In the '''Scaling Type''' section, click the '''Linear''' 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.
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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.
<div style="background-color: #F8F6CD;">Important: Margins should not be used with a Semi-Log price scale.</div>
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=== Setting Semi-Log Scaling Type ===
Scaling Type is set from the '''Format Instruments''' window:
# Open the '''Format Instruments''' window.<br><span>{{FormatSymbol}}</span>
# Select the '''Scaling''' tab.
# 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.
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[[Category:Chart Scaling]]