tokens: Deviations from the nominal geometry of the reflector shall be quantified and their impact on antenna performances assessed . NOTE 1 Reflectors can require hold - down and release , deployment as well as pointing devices . ECSS - E - ST-33 - 11 and ECSS - Q - ST-70 are relevant and applicable in this case . NOTE 2 Typical deviations are due to manufacturing errors , thermo - elastic effects and modification of the material characteristic in the orbit environment , moisture release in composites .