Strutt|Criteria|Ratings|Sound Level|LDEN calculates the Day-Evening-Night noise level `L_(DEN)` and inserts it into the active row.
`L_(DEN)` is calculated as:
`L_(DEN)=10log(10^(L_D/10)+10^((L_E+5)/10)+10^((L_N+10)/10))`, where:
`L_D` is the day noise level
`L_E` is the evening noise level
`L_N` is the night noise level