Figure 3. An expanded view of the data near telescope jumps e through h is shown in this figure. Like the data shown in Figure 2, these data illustrate how the telescope jumps are caused by weather updates of the TCC data base which drive the secondary in a direction opposite to the sag motions of the piston. The last temperature discontinuity shown in this figure near 4.4 hours UT triggers jump i which is shown in Figure 1, but is cut off by the windowing of this figure.