Supporting Information Magnitude and origin of electrical noise at individual grain boundaries in graphene Vidya Kochat, *,† Chandra Sekhar Tiwary, ‡ Tathagata Biswas, † Gopalakrishnan Ramalingam, ¶ Kimberly Hsieh, † Kamanio Chattopadhyay, ‡ Srinivasan Raghavan, ¶,§ Manish Jain, † and Arindam Ghosh †,§ †Department of Physics, Indian Institute of Science, Bangalore 560 012, India ‡Department of Materials Engineering, Indian Institute of Science, Bangalore 560 012, India ¶Materials Research Center, Indian Institute of Science, Bangalore 560 012, India §Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore 560 012, India E-mail: vidyakochat@physics.iisc.ernet.in 1