Name: Get statistical values from fricative spectral slices
Description; This can be considered an update of File 1 and 2. It will take a textgrid with fricative labels and first find the middle 50% of the fricative, label it on tier 3, and create a spectral slice (spectrum object). It will then measure the four statistical values from this slice and return the labels and values. It loops through every fricative labeled in the textgrid, and it loops through all the different textgrids in the object window if multiple sound-textgrid pairs are selected at the same time. It also returns the F1/F2 values for the end of the fricative 10ms into the vowel.