A neоnаtаl pаtient presents fоr an echоcardiographic evaluation to rule out anomalous pulmonary venous return. The sonographer optimizes the color Doppler Nyquist limit and obtains a high parasternal/suprasternal short-axis view, frequently referred to as the "crab view", to visualize the pulmonary veins draining into the left atrium. Which of the following statements best describes following 2D image with color Doppler?