1. Department of Physics and Astronomy, Bishop’s University, 2600 College Street, Sherbrooke, QC, J1M 1Z7 Canada
2. Physics Department, Champlain College-Lennoxville, 2580 College Street, Sherbrooke, QC, J1M 0C8 Canada
3. Département de Physique, Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montréal, QC, H3T 1J4 Canada