visad/src/main/java/ucar/nc2/iosp/gempak/GempakFileReader.java
public RData DM_RDTR(int irow, int icol, String partName)
          throws IOException {
    return DM_RDTR(irow, icol, partName, 1);
  }
public RData DM_RDTR(int irow, int icol, String partName)
          throws IOException {
    return DM_RDTR(irow, icol, partName, 1);
  }
Read the data

@param irow     row to read
@param icol     column to read
@param partName part name
@return the header and data array  or null;
@throws IOException problem reading file