One of the types of objects in Praat. Ltas is short for LongTerm Average Spectrum.
An object of class Ltas represents the logarithmic power spectral density as a function of frequency, expressed in dB/Hz relative to 2·10^{5} Pa.
Inside an Ltas object
With Inspect, you will see the following attributes:

x_{min}

the bottom of the frequency domain, in hertz. Usually 0.

x_{max}

the top of the frequency domain, in hertz.

n_{x}

the number of frequency bins (≥ 1).

dx

the frequency step, or bin width, in hertz.

x_{1}

the frequency associated with the first bin, in hertz. Usually equals dx / 2, because the first bin tends to start at 0 hertz.

z_{1i}, i = 1 ... n_{x}

the power spectral density, expressed in dB.
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© Paul Boersma 20070320