Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with programs #6127, #6411 & #10351.

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In this paper we refer to dimensions projected on the plane of the sky. Note that the inclination of the HH 154 jet is almost equal to $45^{\circ}$ (FL05).

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... vertexes

A procedure to this effect is available in SAOImage.

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