Fig. 4. Multi-dimensional profiles illustrating the effects of nutrient consumption on growth (mass gain) by normal unparasitized M. sexta larvae and larvae parasitized by C. congregata, maintained over the fourth and fifth stadia on a chemically defined artificial diet having varying ratios of casein and sucrose. (A,C) Three-dimensional models for normal and parasitized larvae. (A) Normal: F=49.04, P<0.0001, r²=0.9491; (B) parasitized: F=148.38, P<0.0001, r²=0.9624. (B,D). Contour maps for normal and parasitized larvae, respectively. Nutrient rails shown for the individual diets. Actual mass gain by individual larvae indicated by filled circles.