An ophthalmic marker having a U-shaped yoke at one end of a cranked axle is disclosed. The NOx estimation module estimates an amount of NOx in an exhaust gas produced by an engine based on a predetermined function of a position of at least one of a camshaft phaser and an exhaust gas recirculation valve. The article preferably comprises a heat-shrinkable sleeve for a high-temperature transmission pipeline. By being able to combine the effects of energy absorption due to deformation of the ribs with that of energy absorption due to twisting deformation of the torsion bar, a force limiter load immediately increases as soon as the spool starts to rotate. Formations on the outer faces of the side walls latchingly engage the grip parts in the open position for retaining the cover halves in the open positions.