X-ray count rate in the [0.3–4] keV band of light jet models, named in the horizontal axis as described in Table 1. In the vertical axis we plot the median count rate in every case (represented with a diamond). The lower and upper error bars indicate the 15th and 85th percentile, respectively. The dashed lines indicate the interval of the count rate observed for HH 154. The orange circle indicates the reference case. The shadowed part corresponds to the scale of Fig. 6, which summarizes the heavy jet models described in the next subsection.