Headspace gas composition was analyzed before opening packages, just after the high pressure treatment, i.e. day 0, and then during chilled storage at days 14 and 21 using a CheckMate 9900 gas analyzer (PBI Dansensor, Ringsted, Denmark) and expressed as % CO2 and % O2. The remaining gas was N2. Headspace gas composition was determined from six trays analyzed at the mentioned selected storage days for each condition defined above.