[sdiy] Tempcos of Xicon and LCR polystyrene caps

[Grant Richter]

>
> The LCR FSCEX polystyrene caps are five times more expensive. That
> may be because they are more precise (1% vs. 5% for the Xicon
> parts) but they also claim -50/+110 PPM/°C.
>

There is a tolerance for the slope of the curve. If -250 ppm / deg C  
is spec then tolerance says actual slope can vary from  -300 ppm /  
deg C to -140 ppm / deg C.