When experts are heard, either before courts or tribunals, or before investigating magistrates in connection with the assignment entrusted to them, they shall be awarded, in addition to their travel and subsistence expenses if applicable, an allowance determined by the following formula: I = 3.05 euros + (S × 4),
where S is the minimum interprofessional growth wage as fixed on 1st January of the current year.
When the hearing referred to in the first paragraph takes place before an assize court, a juvenile assize court or a departmental criminal court, the allowance allocated is determined by the following formula: I = 59 euros + (S × 4).
Experts who can prove that they have lost part of their income from their professional activity are also entitled to additional compensation calculated according to the formula I = S x D, in which:
S is the minimum interprofessional growth wage determined as above;
D is the hourly duration of the appearance, which may not exceed eight hours per working day.