MQL4 Reference 
Custom indicators SetLevelStyle
| void SetLevelStyle( |
int draw_style, int line_width, color clr=CLR_NONE) |
The function sets a new style, width and color of horizontal levels of indicator to be output in a separate window.
Parameters:
| draw_style |
- |
Drawing style. Can be one of the Drawing shape styles listed. EMPTY value means that the style will not be changed. |
| line_width |
- |
Line width. Valid values are 1,2,3,4,5. EMPTY value indicates that the width will not be changed. |
| clr |
- |
Line color. Empty value CLR_NONE means that the color will not be changed. |
Sample:
//---- show levels as thick red lines
SetLevelStyle(STYLE_SOLID,2,Red)
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