Translations:Draft Slope/3/en

The slope value is the tangent of the elevation angle:
 * 0 means the line is completely horizontal, because tan(0°) = 0.
 * 1 means 45 degrees up, because tan(45°) = 1.
 * 0.577 means 30 degrees up, because tan(30°) = 0.577.
 * 1.732 means 60 degrees up, because tan(60°) = 1.732, etc.