The MSFD indicator requires measurement of a yearly mean thirdoctave level for each of the 63-Hz and 12-Hz indicator bands. Longterm levels are calculated over multiple deployments according to the period covered and deployment configurations (Table 3). This includes mean and percentile values covering 12 months from deployments 2 to 6, which had identical configurations, although this also contains a break in the data from March to May 2013 (Table 3).