# Set reference line for y-axis

Use this option to specify a custom reference line to be drawn on the Bubble Plot.

Lines are set for each domain as described in the following table:

Domain | Equivalent to:
LB | Lab measurements are automatically standardized by the LLN and ULN such that the line is drawn at k*ULN of the y-axis lab test, where k is the integer chosen in this field.
EG | Electrocardiogram measurements are plotted on their original scale.
VS | Vital signs measurements are plotted on their original scale.

### To Set a Reference Line for the y-Axis of the Bubble Plot:

| 8 | Either enter the desired value in the text field or move the slider to the right or to the left to change the value.

Tip: To change the scale of the slider, right-click on the slider and select
from the pop-up menu. Change the upper or lower boundaries in the that appears, to rescale the slider and click
.