And the common theme to all of our customers is that we -- they use our tools to develop the next generation applications, the smaller features or smaller devices to improve the yields by controlling the process variations and therefore reducing their manufacturing costs, the return on investment for products like in process controller area are very high and as a consequence more the capital spending in general goes to process control than in process tools as time design.
So this picture is a little schematic to show you, a little bit of what we measure and this is an example of 6-Transistor SRAM Cell, and you see the building device software, the layer after layer that comes in to that make every device and we – they use our tools to make these measurements along each of process steps, so in this case it maybe thickness of the film or width of the particular area, then they build another, might be the dimension here in the height, then they will measure the length and depth and pitch.
And in every one of our measurements, the use it through a sequence of measurements but then we also collectively measure what’s happen to the layers below, so we don’t measure just a surface, we measure down interim material and to make sure that the properties of the previous layer haven’t been disturb by the subsequent process steps.
So what drives our business, well, the first one is, most law is shrinking the device, as they make the device smaller this particularly graph shows, technology more than semiconductor going from 130 nanometer as the small feature down to 22 nanometer, which is one of most advance nodes at this time and actually working on nodes below that in the one X 18 and 14.
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