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    "header": {
      "title": "La corriente más rápida del pasillo va camino de la fuga",
      "subtitle": "Pasillo frío B2 — velocidad del aire a media altura de rack, rejilla de 1,2 m, media de cinco minutos"
    },
    "footer": {
      "source": "Levantamiento con anemómetro de hilo caliente a 1,1 m sobre 28 puntos de una rejilla de 1,2 m — sala y cifras ilustrativas",
      "notes": "Cada flecha es un punto de la rejilla: el ángulo y la longitud salen de las dos componentes medidas (u a lo largo del pasillo, v a lo ancho) y el color, del balance de su celda —la divergencia ∂u/∂x + ∂v/∂y—. Rojo: entra caudal al plano desde fuera, que aquí son las baldosas perforadas. Azul: el caudal converge y se marcha del plano, que a media altura de rack sólo puede ser por arriba. La escalera gradúa la longitud; el balance se publica en relativo al más fuerte del propio campo y no es comparable con el de otra lámina. Entre dos flechas no hay dato: hay rejilla.",
      "alt": "Veintiocho flechas en una rejilla de 7×4 sobre 7,2 × 3,6 m. Las tres columnas centrales son rojas y apuntan hacia afuera de la línea media, hacia las dos filas de racks: son las baldosas que entregan, con un máximo de aporte en el centro. En x = 6,0 las flechas son grises y las más largas del levantamiento, hasta 1,93 m/s, apuntando a lo largo del pasillo. La última columna, x = 7,2, es azul en sus cuatro puntos y las flechas convergen unas contra otras: ahí el aire se pierde por encima de los racks."
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