**Figure F5.** Example of paleointensity data using submarine basaltic glass from Site 1203 (from Smirnov and Tarduno, 2003). **A.** Thermal demagnetization of natural remanent magnetization (NRM). **B. **Acquisition of thermal remanent magnetization (TRM). **C.** Orthogonal vector plot of field-off steps (sample is unoriented). Open squares = vertical projection of NRM, solid circles = horizontal projection. **D.** NRM/TRM plot (circles). Squares = partial TRM experimental checks. **E.** Magnetic hysteresis parameters as a function of temperature on a monitor sample. The total saturation magnetization (*M*s total) is shown before slope correction together with the paramagnetic contribution. The change in these curves denotes experimentally-induced alteration.