Corrections
Picture captions in Science Times on Tuesday with an article about new ways of using radar to measure changes in the earth's surface referred incorrectly to two images of Mount Etna and an image of the Landers Fault in California. The top image of Mount Etna showed the actual deformation of the volcano obtained after processing of radar data, not the raw data. The bottom image was a computer simulation of the deformation made from a mathematical model; it did not come from the radar. Similarly, the image of the Landers Fault was a computer simulation of the fault's deformation.