> I'm a bit confused by "junction" in this statement. Does this mean
> that an ambient temperature of -10 will make the LM317 unable to work,
> or does it mean that it will be fine as long as the junction is no
> colder than 0 degrees?

The way these devices are specified that is the temperature of the chip 
inside the package at which the specifications are guaranteed. In practice 
even with a -10C rink temperature the temperature of the chi will most 
likely be within its quoted operating range, because of temperature 
dissipation in the chip. 

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