By default, the Tfi property is "", which indicates no effect. The Title property specifies the title of the category-axis. The Format property defines the labels of the category-axis.

The Tfi property defines the following font-attributes, separated by white-spaces characters, as explained:

• bold,  indicates that the labels and title are shown in bold
• italic,  indicates that the labels and title are shown in italics
• underline, underlines the labels and title
• strikeout, strikeouts the labels and title
• <fgcolor color>, defines a different foreground color for labels and title
• <bgcolor color>, defines a different background color for labels and title
• <out color;width>, shows the text with outlined characters, where color field defines the outline color, 808080 if missing as gray, width indicates the size of the outline, 1 if missing.
• <sha color;width;offset>, define a text with a shadow, where color defines the shadow color, 808080 if missing as gray, width indicates the size of shadow, 4 if missing, and offset indicates the offset from the origin to display the text's shadow, 2 if missing.
• <gra color;mode;blend>, defines a gradient text. The text color or <fgcolor> defines the starting gradient color, while the color field defines the ending color, 808080 if missing as gray
• any number, indicates the size of the font to use
• any other string, defines the name of the font to use

where the color field accepts values in various formats: RRGGBB format, which represents the red(RR), green(GG), and blue(BB) values in hexadecimal format; named colors defined in CSS; or RGB format specified as rgb(RED,GREEN,BLUE), where RED, GREEN, and BLUE range from 0 to 255. The mode is a value between 0 and 4, 1 if missing, and blend could be 0 or 1, 0 if missing. The width indicates the size of shadow or gradient.

You can use the Color property to specify a different background color for category-axis. The Tfi property is not applied to labels defined by ChartGridLines or OverviewGridLines property.

For instance:

• "bold", shows the labels and title in bold
• "<fgcolor red>", shows the labels and title in red
• "underline Tahoma 12", shows the labels and title underlined with a Tahoma 12px font