CITROËN C3 Handbook page 148

Safety
(a) Refer to the legislation in force in your
country before installing a child at this
seating position.
IUF: seating position suitable for the installation
of an Isofix Universal seat, Forward facing
secured using the upper strap.
IL-SU: seating position suitable for the
installation of an Isofix Semi-Universal
seat either:
- rearward facing fitted with an upper strap
or a support leg,
- forward facing fitted with a support leg,
- a cot fitted with an upper strap or a support
leg.
For securing the upper strap using the ISOFIX
mountings, refer to the corresponding section.
X: seating position not suitable for the
installation for an ISOFIX seat or cot of the
weight group indicated.
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(1): the installation of the cot at this seating
position may prevent the use of one or
more seats in this row.
(2): adjust the front seat to the fully forward
position.
(3): adjust the front seat to 16 notches minimum
from the fully rearward position.
Remove and stow the head restraint
before installing a child seat with a
backrest on a passenger seat. Refit the
head restraint once the child seat has
been removed.