Structural Equation Model to Estimate Covariances between Family Income, NAcc rsFC, Reward Salience, and Substance Use (Note: CON = Left Cingulo-Opercular Network; FS = Fun Seeking; Income = Family Income; MAR = Marijuana Use Initiation; NAcc = Nucleus Accumbens; Rew Sal = Reward Salience; RR = Reward Responsiveness; rsFC= Resting State Functional Connectivity; SMH = Right Sensorimotor Hand Network = SMH; SMM = Left Sensorimotor Mouth Network; Subs = Substance Use; TOB = Tobacco Use Initiation)