Table:
Variables used	Coded levels
−1	0	+1
Xanthan gum (mg)	40	50	60
Locust bean gum (mg)	60	70	80

Render the figure in Markdown format.

| <ROWSPAN=2> Variables used | <COLSPAN=3> Coded levels | 
 | −1 | 0 | +1 | 
 | --- | --- | --- | --- | 
 | Xanthan gum (mg) | 40 | 50 | 60 | 
 | Locust bean gum (mg) | 60 | 70 | 80 |