Charming Anime Girl Sitting on Grass in a Serene Environment

Create a scientific diagram explaining the notion of surrogate modeling. The computer code to emulate is a nuclear reactor simulator. The diagram should contain : some 2D curve representing the physics of a nuclear reactor ; and some mathematical curve trying to fit the latter physics curve. The image should be sober, academical-looking, without any text, The image depicts a young anime girl with long black hair styled in twintails, sitting on a grassy area. She wears a beige coat with a white collar over a dark skirt and stockings, with brown shoes. The background features a soft gradient from light blue to white, indicating a serene outdoor environment. The girl looks directly at the viewer with a gentle expression, conveying a sense of calm and tranquility. The overall aesthetic is vibrant and engaging, typical of anime art style, emphasizing the character’s playful yet relaxed demeanor