There is provided a niobium alloy powder suitable for manufacturing solid electrolytic capacitors having small leakage currents and high capacitances, where the powder is obtained by enhancing the thermal stability of the niobium oxide coating film while improving the temperature dependence of the sintering behavior of the powder. The spring has a compressibility that is sufficient for allowing the guided part to come out of the guiding area, and the slide can pivot about the longitudinal axis thereof in order to remain blocked in an \u201cout-blocked\u201d position that facilitates the assembling or disassembling operations of the knuckle with a spigot. The processor accesses a first pixel having a first depth location, and a second pixel having a second depth location.