Your ranking of India's top ten institutions, scored by the number of research papers in the Scopus citation database over the past five years, is distorted by the exceptionally large number of citations attracted by papers with hundreds of authors (see Nature 521, 142–143; 2015).

This distortion is often corrected by limiting citations to individual authors — for example, by using an individual h-index for reference. Another corrective measure would be to exclude papers with more than 100 authors from citation metrics. For example, the Large Hadron Collider's ATLAS collaboration includes thousands of authors, so exclusion would have roughly the same effect as using the individual h-index (J. E. Hirsch Proc. Natl Acad. Sci. USA 102, 16569–16572; 2005).

Exclusion would introduce major changes in some of your listed entries. For example, I calculate that about 20% of the publications attributed to the highly rated Panjab University have long author lists and contribute almost two-thirds of the citations. Excluding these papers reduces Panjab University's citation impact ratio from 1.4 to 0.7, causing it to drop out of your top ten; the fall is comparable for your second-placed Tata Institute of Fundamental Research in Mumbai. The fall for the Indian Institute of Technology at Bombay and Guwahati is less marked at 15% and 12%, respectively, because these each generate proportionally fewer papers with long author lists.