Dichroic model is inconsistent between blue and red

import numpy as np
import matplotlib.pyplot as plt
blueData = np.genfromtxt("../drp_instdata/data/throughput/pfs_thr_20201231_ext_all_blu.dat")
redData = np.genfromtxt("../drp_instdata/data/throughput/pfs_thr_20201231_ext_all_red.dat")
wavelength = np.concatenate((blueData[:2600, 0], redData[:, 0]))
assert(np.all(blueData[2600:, 0] == redData[:401, 0]))
blue = np.zeros_like(wavelength)
blue[:3001] = blueData[:, 5]
red = np.zeros_like(wavelength)
red[2600:] = redData[:, 5]
total = blue + red
plt.plot(wavelength, blue, "b-")
plt.plot(wavelength, red, "r-")
plt.plot(wavelength, total, "k-")
plt.xlabel("Wavelength (nm)")
plt.ylabel("Dichroic transmission")
plt.suptitle("pfs_thr_20201231_ext_all_*.dat")
plt.show()