Regulation 14(1) reads as follows:
The sulphur content of any fuel oil used on board ships shall not exceed 4.5% m/m.
Regulation 14(4)(a) reads as follows:
the sulphur content of fuel oil used on board ships in a SOx emission control area does not exceed 1.5% m/m;
Interpretation:
The limits should be read as given with two decimal digits, 4.50% m/m and 1.50% m/m respectively.