Table 4.

NC Production fixed effects.

Parameter	Estimate	Std. Error	t-value
Intercept	48.75	8.29	5.88**
X position	370.00	57.41	6.45**
Real objects	38.08	5.79	6.58**
X position × Real objects	398.82	38.24	10.43**
X position2	−381.76	61.05	−6.25**
X position2 × Real objects	−397.88	38.18	−10.42**

^**p < 0.01.