<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hello,<div> When I use grads to plot a field in a large grib file (~3.1GB), to the end of 1/3 of the file the output are always wrong. I doubt is is owing to the command gribmap can't handle such a big file. The following is the part of output from the gribmap command:</div><div><br></div><div><div>!!!!! MATCH: 16462 2147303268 255 1 0 135 100 175 2147172943 0 16 btim: 1992012206:00 tau: 0 dtim: 1992012206:00</div><div>!!!!! MATCH: 16463 2147433708 255 1 0 131 100 175 2147303383 0 16 btim: 1992012206:00 tau: 0 dtim: 1992012206:00</div><div>!!!!! MATCH: 16464 2147564148 255 1 0 132 100 175 2147433823 0 16 btim: 1992012206:00 tau: 0 dtim: 1992012206:00</div><div>!!!!! MATCH: 16465 2147694588 255 1 0 129 100 150 -2147403033 0 16 btim: 1992012206:00 tau: 0 dtim: 1992012206:00</div><div>!!!!! MATCH: 16466 2147825028 255 1 0 130 100 150 -2147272593 0 16 btim: 1992012206:00 tau: 0 dtim: 1992012206:00</div><div>!!!!! MATCH: 16467 2147955468 255 1 0 133 100 150 -2147142153 0 16 btim: 1992012206:00 tau: 0 dtim: 1992012206:00</div><div>!!!!! MATCH: 16468 2148085908 255 1 0 135 100 150 -2147011713 0 16 btim: 1992012206:00 tau: 0 dtim: 1992012206:00</div><div><br></div><div>As you can see there are negative numbers after 150 in several lines. </div><div><br></div><div><br></div><div><br></div></div><br><br><div> <p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">Dr. Hai-Ru Chang</font></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">School of Earth and Atmospheric Sciences</font></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">Georgia Institute of Technology</font></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">Atlanta, GA 30332-0340</font></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px"><br></p> </div><br></body></html>