We present spectroscopic observations for quasars Q0107 - 025A , Q0107 - 025B , and Q0107 - 0232 .
For the first time , all data obtained with the Hubble Space Telescope’s GHRS and FOS for these three quasars are combined .
Ly \alpha absorbers selected from the spectra can be used to trace the coherence of the intergalactic medium ( IGM ) on scales of 1 - 2 h _ { 70 } ^ { -1 } Mpc over the redshift range 0.4 < z _ { a } < 0.9 .
A new analysis of double and triple absorber coincidences derived from the improved spectra is performed .
Automated line-selection algorithms were used to detect absorption lines in the QSO spectra ; coincident absorbers were identified across two and three sight lines based on their proximity to each other in velocity space .
A control simulation designed to generate artificial absorption-line spectra was used to gauge the significance of the coincidences .
Four intervening metal line absorption systems are detected , with three of the four coincident to the A and B sight lines and one coincident across all three sight lines .
This is evidence for substantial clustering among the objects responsible for the metal-enriched gas .
By contrast , large scale coherence of the IGM gas is detectable but weak .
Fewer than half of the absorbers are coincident on scales of 1 - 2 h _ { 70 } ^ { -1 } Mpc , a result that is significant at the 99 % confidence level , and coherence arises preferentially in the higher column density gas .
Triple absorber coincidences occur at a level that is significant at the 99 % confidence level , which indicates that the higher column density gas has a planar geometry .